{"id":92,"date":"2020-07-12T13:21:24","date_gmt":"2020-07-12T04:21:24","guid":{"rendered":"http:\/\/192.168.20.1\/?p=92"},"modified":"2024-02-16T07:40:39","modified_gmt":"2024-02-15T22:40:39","slug":"cisco-flexlink","status":"publish","type":"post","link":"https:\/\/rlab.cavtime.net\/?p=92","title":{"rendered":"Cisco FlexLink"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>CiscoSystems IOS \u306b\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b FlexLink \u306e\u52d5\u4f5c\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n<h2><a id=\"reference\"><\/a>Reference<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.cisco.com\/c\/ja_jp\/td\/docs\/sw\/campuslanswt-coredistribution\/cat6500swt\/cg\/002\/15-1-sy-c4-swcg\/flexlinks.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Flex Link<\/a>\u00a0(CiscoSystems)<\/li>\n<\/ul>\n<h2><a id=\"flexlinkfunction\"><\/a>Flex Link Function<\/h2>\n<p>CiscoSystems\u793e\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u3088\u308c\u3070 FlexLink \u306f\u4e0b\u8a18\u306e\u52d5\u4f5c\u3092\u3059\u308b\u3002<\/p>\n<ol>\n<li>\u969c\u5bb3\u3092\u691c\u51fa<\/li>\n<li>Primary Link \u3067\u5b66\u7fd2\u3055\u308c\u305f Dynamic Unicast MAC Address \u3092 Standby Link \u306b\u79fb\u884c<\/li>\n<li>Standby Link \u3092 Forwarding State \u306b\u79fb\u884c<\/li>\n<li>\u65b0\u3057\u3044 Active Interface \u7d4c\u7531\u3067 Dummy Multicast Packet \u3092\u9001\u4fe1<\/li>\n<\/ol>\n<h2><a id=\"checkpoint\" class=\"anchor\"><\/a>Check Point<\/h2>\n<h3>FlexLink\u6a5f\u80fd\u78ba\u8a8d<\/h3>\n<p>\u4e0a\u8a18\u306eFlexLink\u52d5\u4f5c\u306e\u4e2d\u3067\u78ba\u8a8d\u3059\u308b\u4e8b\u9805\u306f<\/p>\n<ul>\n<li>SW01 \u3067 Dummy Multicast Packet \u306e\u9001\u4fe1<\/li>\n<li>SW02 \u3067 Dummy Multicast Packet \u306e\u53d7\u4fe1<\/li>\n<li>SW02 \u3067 mac address-table \u3067 Host \u306e MAC Address \u306e Forward Interface \u306e\u5909\u5316<\/li>\n<\/ul>\n<p>\u3067\u3042\u308b\u3002<\/p>\n<h3>\u901a\u4fe1\u5f71\u97ff\u78ba\u8a8d<\/h3>\n<p>FlexLink\u306b\u3088\u308b\u901a\u4fe1\u7d4c\u8def\u5207\u308a\u66ff\u308a\u306b\u3088\u308b\u901a\u4fe1\u306e\u5f71\u97ff<\/p>\n<h2><a id=\"summary\" class=\"anchor\"><\/a>Summary<\/h2>\n<h3>\u7d50\u679c<\/h3>\n<p>\u3053\u3053\u3067\u306f\u52d5\u4f5c\u78ba\u8a8d\u306e\u7d50\u679c\u3092\u8a18\u8f09\u3059\u308b\u3002<\/p>\n<ul>\n<li>Link down \u3068\u307b\u307c\u540c\u6642\u306bForwardingPort\u306e\u5207\u308a\u66ff\u308a\u3068Dummy Multicast Packet\u3092\u9001\u51fa<\/li>\n<li>Catalyst2960S \/ 15.2(2)E9 \u306e IOS \u3067\u306f\u7121\u901a\u4fe1\u306eMAC Address\u306f15\u79d2\u7a0b\u5ea6\u3067mac address-table\u304b\u3089\u524a\u9664\u3055\u308c\u308b\u73fe\u8c61\u304c\u767a\u751f<\/li>\n<li>Ping\u306ePacket Loss\u306f1\u79d2\u7a0b\u5ea6\u4ee5\u5185<\/li>\n<\/ul>\n<p>\u3068\u306a\u3063\u305f\u3002<\/p>\n<h3>\u518d\u691c\u8a3c<\/h3>\n<p>\u307e\u305f Dummy Multicast Packet \u3092 SW02 \u304c\u53d7\u4fe1\u3057\u305f\u6642\u306e mac address-table \u306e aging time \u306e\u52d5\u4f5c\u306b\u3064\u3044\u3066\u306f\u5225\u9014\u3001\u52d5\u4f5c\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3068\u3059\u308b\u3002<\/p>\n<ul>\n<li><a href=\"https:\/\/rlab.cavtime.net\/?p=89\">Cisco Flex Link Dummy Multicast Packet MAC address aging time<\/a><\/li>\n<\/ul>\n<h2><a id=\"networkdiagram\" class=\"anchor\"><\/a>Network Diagram<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"img-responsive right-block\" src=\"https:\/\/rlab.cavtime.net\/wp-content\/uploads\/2021\/04\/Cisco_FliexLink_Basic.png\" alt=\"\" width=\"801\" height=\"321\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><a id=\"environment\" class=\"anchor\"><\/a>Environment<\/h2>\n<h3>SW01 \/ SW02<\/h3>\n<pre>Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 15.2(2)E9, RELEASE SOFTWARE (fc4)\r\nTechnical Support: http:\/\/www.cisco.com\/techsupport\r\nCopyright (c) 1986-2018 by Cisco Systems, Inc.\r\nCompiled Sat 08-Sep-18 14:56 by prod_rel_team\r\n\r\nROM: Bootstrap program is C2960S board boot loader\r\nBOOTLDR: C2960S Boot Loader (C2960S-HBOOT-M) Version 12.2(55r)SE, RELEASE SOFTWARE (fc1)\r\n<\/pre>\n<h3>SW03 \/ SW04<\/h3>\n<pre>Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(35)SE2, RELEASE SOFTWARE (fc1)\r\nCopyright (c) 1986-2007 by Cisco Systems, Inc.\r\nCompiled Tue 06-Feb-07 01:27 by antonino\r\nImage text-base: 0x00003000, data-base: 0x01240AEC\r\n\r\nROM: Bootstrap program is C3750 boot loader\r\nBOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEE4, RELEASE SOFTWARE (fc1)\r\n<\/pre>\n<h3>PC<\/h3>\n<pre>$ cat \/etc\/os-release\r\nNAME=\"Ubuntu\"\r\nVERSION=\"18.04.4 LTS (Bionic Beaver)\"\r\nID=ubuntu\r\nID_LIKE=debian\r\nPRETTY_NAME=\"Ubuntu 18.04.4 LTS\"\r\nVERSION_ID=\"18.04\"\r\nHOME_URL=\"https:\/\/www.ubuntu.com\/\"\r\nSUPPORT_URL=\"https:\/\/help.ubuntu.com\/\"\r\nBUG_REPORT_URL=\"https:\/\/bugs.launchpad.net\/ubuntu\/\"\r\nPRIVACY_POLICY_URL=\"https:\/\/www.ubuntu.com\/legal\/terms-and-policies\/privacy-policy\"\r\nVERSION_CODENAME=bionic\r\nUBUNTU_CODENAME=bionic\r\n$ \r\n<\/pre>\n<h2><a id=\"configuration\" class=\"anchor\"><\/a>Configuration<\/h2>\n<h3>SW01<\/h3>\n<pre>!\r\ninterface GigabitEthernet1\/0\/1\r\n switchport backup interface Gi1\/0\/2\r\n switchport backup interface Gi1\/0\/2 preemption mode forced\r\n!\r\ninterface GigabitEthernet1\/0\/2\r\n!\r\ninterface GigabitEthernet1\/0\/11\r\n switchport access vlan 2\r\n!\r\n!\r\ninterface Vlan1\r\n no ip address\r\n shutdown\r\n!\r\ninterface Vlan2\r\n ip address 192.168.201.1 255.255.255.0\r\n!\r\nip default-gateway 192.168.201.254\r\n!\r\nntp server 192.168.1.10\r\n!\r\n<\/pre>\n<h3>SW02<\/h3>\n<pre>!\r\ninterface GigabitEthernet1\/0\/1\r\n!\r\ninterface GigabitEthernet1\/0\/2\r\n!\r\ninterface GigabitEthernet1\/0\/11\r\n switchport access vlan 2\r\n!\r\ninterface Vlan1\r\n ip address 192.168.202.2 255.255.255.0\r\n!\r\ninterface Vlan2\r\n ip address 192.168.201.2 255.255.255.0\r\n!\r\nip default-gateway 192.168.201.254\r\n!\r\nntp server 192.168.1.10\r\n!\r\n<\/pre>\n<h3>SW03 \/ SW04<\/h3>\n<ul>\n<li>Default Configuration<\/li>\n<\/ul>\n<h3>MAC Address<\/h3>\n<ul>\n<li>f0de.f12e.f993 : PC NIC<\/li>\n<li>c07b.bcbb.fcc0 : SW01 Interface vlan1<\/li>\n<\/ul>\n<h2><a id=\"methods\" class=\"anchor\"><\/a>Methods<\/h2>\n<p>Function \u3067\u8a18\u8f09\u3057\u305f\u52d5\u4f5c\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b<\/p>\n<ul>\n<li>SW01 : console message \u3067 interface down \/ up \u3092\u78ba\u8a8d\u3059\u308b<\/li>\n<li>SW02 : PC NIC \u3068 SW01 interface vlan 1 \u306e MAC Address \u306e forwarding port \u304c\u5207\u308a\u66ff\u308f\u3063\u3066\u3044\u308b\u3053\u3068\u3092 show mac address-table dynamic command \u3067\u78ba\u8a8d\u3059\u308b<\/li>\n<li>PC : \u5207\u66ff\u306b\u4f34\u3046 Ping \u306e Packet Loss \u3092\u78ba\u8a8d\u3059\u308b<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u306e3\u70b9\u3067\u3042\u308b\u3002<\/p>\n<h2><a id=\"trafficoff-linkdown\" class=\"anchor\"><\/a>Traffic off \/ Link down<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"img-responsive right-block\" src=\"https:\/\/rlab.cavtime.net\/wp-content\/uploads\/2021\/04\/Cisco_FliexLink-SW01_LinkDown.png\" alt=\"\" width=\"801\" height=\"321\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3>SW01 : Link down<\/h3>\n<pre>sw01#\r\nJul 11 15:17:39: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1\/0\/1, changed state to down\r\nJul 11 15:17:40: %LINK-3-UPDOWN: Interface GigabitEthernet1\/0\/1, changed state to down\r\nsw01#\r\n<\/pre>\n<h3>SW02 : mac address-table state<\/h3>\n<pre>sw02#show mac address-table dynamic\r\nLoad for five secs: 5%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:17:21.127 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/1\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 6\r\nsw02#\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 8%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:17:40.128 JST Sat Jul 11 2020 &lt;----- Link down \u3068\u307b\u307c\u540c\u6642\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    c07b.bcbb.fcc0    DYNAMIC     Gi1\/0\/2\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/2 &lt;----- Interface\u5207\u308a\u66ff\u308f\u308a\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 7\r\nsw02#\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 12%\/0%; one minute: 7%; five minutes: 6%\r\nTime source is NTP, 15:17:53.718 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    c07b.bcbb.fcc0    DYNAMIC     Gi1\/0\/2\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/2\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 7\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 12%\/0%; one minute: 7%; five minutes: 6%\r\nTime source is NTP, 15:17:54.342 JST Sat Jul 11 2020 &lt;----- \r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 5\r\nsw02#\r\n<\/pre>\n<h3>SW02 : mac address-table \u4fdd\u6301\u6642\u9593<\/h3>\n<ul>\n<li>SW02 \u3067 Port \u306e\u5207\u308a\u66ff\u308a\u78ba\u8a8d\uff1a15:17:40.128<\/li>\n<li>SW02 \u3067 mac address-table \u304b\u3089 PC \u306e MAC Address\u304c\u524a\u9664\uff1a15:17:54.342<\/li>\n<li>\u7d4c\u904e\u6642\u9593\uff1a0:00:14.214<\/li>\n<\/ul>\n<p>15\u79d2\u7a0b\u5ea6\u3067 MAC Address Table \u304b\u3089\u524a\u9664\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<h2><a id=\"trafficoff-linkup\" class=\"anchor\"><\/a>Traffic off \/ Link up<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"img-responsive right-block\" src=\"https:\/\/rlab.cavtime.net\/wp-content\/uploads\/2021\/04\/Cisco_FliexLink-SW01_LinkUp.png\" alt=\"\" width=\"801\" height=\"321\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3>SW01 : Link up<\/h3>\n<pre>sw01#\r\nJul 11 15:22:55: %LINK-3-UPDOWN: Interface GigabitEthernet1\/0\/1, changed state to up\r\nJul 11 15:22:56: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1\/0\/1, changed state to up\r\nsw01#\r\nJul 11 15:23:28: %BACKUP_INTERFACE-5-PREEMPT: Preempting interface Gi1\/0\/2 in backup pair (Gi1\/0\/1, Gi1\/0\/2), preemption mode is forced\r\nsw01#\r\n<\/pre>\n<h3>SW02 : mac address-table state<\/h3>\n<pre>sw02#show mac address-table dynamic\r\nLoad for five secs: 5%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:23:28.501 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 5\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 5%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:23:29.381 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    c07b.bcbb.fcc0    DYNAMIC     Gi1\/0\/1\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/1 &lt;----- \u5207\u308a\u66ff\u308a\u5f8c\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 7\r\nsw02#\r\n\u4e2d\u7565\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 6%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:23:43.685 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    c07b.bcbb.fcc0    DYNAMIC     Gi1\/0\/1\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/1\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 7\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 6%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:23:44.660 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 5\r\nsw02#<\/pre>\n<h3>SW02 : mac address-table \u4fdd\u6301\u6642\u9593<\/h3>\n<ul>\n<li>15:23:29.381 : SW02 \u3067 Port \u306e\u5207\u308a\u66ff\u308a\u78ba\u8a8d<\/li>\n<li>15:23:43.685 : SW02 \u3067 mac address-table \u304b\u3089 PC \u306e MAC Address\u304c\u524a\u9664\u524d<\/li>\n<li><span data-sheets-value=\"{&quot;1&quot;:3,&quot;3&quot;:0.00016555555555552992}\" data-sheets-userformat=\"{&quot;2&quot;:1,&quot;3&quot;:{&quot;1&quot;:6,&quot;2&quot;:&quot;h\\&quot;:\\&quot;mm\\&quot;:\\&quot;ss\\&quot;.\\&quot;000&quot;,&quot;3&quot;:1}}\" data-sheets-formula=\"=R[-1]C[0]-R[-2]C[0]\">\u00a00:00:14.304 :\u00a0<\/span>\u7d4c\u904e\u6642\u9593<\/li>\n<\/ul>\n<p>15\u79d2\u7a0b\u5ea6\u3067 MAC Address Table \u304b\u3089\u524a\u9664\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<h2><a id=\"trafficon-linkdown\"><\/a>Traffic on \/ Link down<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"img-responsive right-block\" src=\"https:\/\/rlab.cavtime.net\/wp-content\/uploads\/2021\/04\/Cisco_FliexLink-SW01_LinkDown.png\" alt=\"\" width=\"801\" height=\"321\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3>SW01 : Link down<\/h3>\n<pre>sw01#\r\nJul 11 15:31:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1\/0\/1, changed state to down\r\nJul 11 15:31:37: %LINK-3-UPDOWN: Interface GigabitEthernet1\/0\/1, changed state to down\r\nsw01#\r\n<\/pre>\n<h3>SW02 : mac address-table state<\/h3>\n<pre>sw02#show mac address-table dynamic\r\nLoad for five secs: 5%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:31:38.478 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    c07b.bcbb.fcc0    DYNAMIC     Gi1\/0\/2\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/2\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 7\r\nsw02#\r\n\u4e2d\u7565\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 6%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:32:07.242 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/2\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 6\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 6%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:32:07.855 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 5\r\nsw02#\r\n<\/pre>\n<h3>SW02 : mac address-table \u4fdd\u6301\u6642\u9593<\/h3>\n<p>15:31:38.478 :<\/p>\n<p>15:32:07.242 :<\/p>\n<p><span data-sheets-value=\"{&quot;1&quot;:3,&quot;3&quot;:0.0003329166666665717}\" data-sheets-userformat=\"{&quot;2&quot;:1,&quot;3&quot;:{&quot;1&quot;:6,&quot;2&quot;:&quot;h\\&quot;:\\&quot;mm\\&quot;:\\&quot;ss\\&quot;.\\&quot;000&quot;,&quot;3&quot;:1}}\" data-sheets-formula=\"=R[-1]C[0]-R[-2]C[0]\">0:00:28.764 :\u00a0<\/span><\/p>\n<h3>Ping<\/h3>\n<pre>$ ping -c 100 -i 0.2 -w 0.8 192.168.202.2 | while read line; do echo `date +'%Y\/%m\/%d %H:%M:%S.%3N'` $line; done | tee -i pingt-linkdown.log\r\n2020\/07\/11 15:31:32.134 PING 192.168.202.2 (192.168.202.2) 56(84) bytes of data.\r\n2020\/07\/11 15:31:32.137 64 bytes from 192.168.202.2: icmp_seq=1 ttl=255 time=2.44 ms\r\n2020\/07\/11 15:31:32.333 64 bytes from 192.168.202.2: icmp_seq=2 ttl=255 time=0.788 ms\r\n\u4e2d\u7565\r\n2020\/07\/11 15:31:34.951 64 bytes from 192.168.202.2: icmp_seq=15 ttl=255 time=1.96 ms\r\n2020\/07\/11 15:31:35.150 64 bytes from 192.168.202.2: icmp_seq=16 ttl=255 time=0.681 ms\r\n2020\/07\/11 15:31:35.760 64 bytes from 192.168.202.2: icmp_seq=19 ttl=255 time=1.51 ms\r\n2020\/07\/11 15:31:35.961 64 bytes from 192.168.202.2: icmp_seq=20 ttl=255 time=1.77 ms\r\n\u4e2d\u7565\r\n2020\/07\/11 15:31:52.243 --- 192.168.202.2 ping statistics ---\r\n2020\/07\/11 15:31:52.245 100 packets transmitted, 98 received, 2% packet loss, time 19909ms\r\n2020\/07\/11 15:31:52.247 rtt min\/avg\/max\/mdev = 0.681\/1.852\/5.746\/1.021 ms\r\n$\r\n<\/pre>\n<h2><a id=\"trafficon-linkup\"><\/a>Traffic on \/ Link up<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"img-responsive right-block\" src=\"https:\/\/rlab.cavtime.net\/wp-content\/uploads\/2021\/04\/Cisco_FliexLink-SW01_LinkUp.png\" alt=\"\" width=\"801\" height=\"321\" \/><\/p>\n<p>&nbsp;<\/p>\n<h3>SW01 : Link Up<\/h3>\n<pre>sw01#\r\nJul 11 15:40:34: %LINK-3-UPDOWN: Interface GigabitEthernet1\/0\/1, changed state to up\r\nJul 11 15:40:35: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1\/0\/1, changed state to up\r\nsw01#\r\nJul 11 15:41:07: %BACKUP_INTERFACE-5-PREEMPT: Preempting interface Gi1\/0\/2 in backup pair (Gi1\/0\/1, Gi1\/0\/2), preemption mode is forced\r\nsw01#\r\n<\/pre>\n<h3>SW02 : mac address-table state<\/h3>\n<pre>sw02#show mac address-table dynamic\r\nLoad for five secs: 7%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:41:06.965 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/2 &lt;----- \u5207\u308a\u66ff\u308f\u308a\u524d\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 6\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 7%\/0%; one minute: 6%; five minutes: 6%\r\nTime source is NTP, 15:41:07.726 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    c07b.bcbb.fcc0    DYNAMIC     Gi1\/0\/1\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/1 &lt;----- \u5207\u308a\u66ff\u308f\u308a\u5f8c\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 7\r\nsw02#\r\nsw02#show mac address-table dynamic\r\nLoad for five secs: 9%\/0%; one minute: 7%; five minutes: 6%\r\nTime source is NTP, 15:41:34.256 JST Sat Jul 11 2020\r\n          Mac Address Table\r\n-------------------------------------------\r\n\r\nVlan    Mac Address       Type        Ports\r\n----    -----------       --------    -----\r\n   1    001b.5455.e902    DYNAMIC     Gi1\/0\/1\r\n   1    0023.5dbd.4d82    DYNAMIC     Gi1\/0\/2\r\n   1    0023.5dbd.4dc0    DYNAMIC     Gi1\/0\/2\r\n   1    f0de.f12e.f993    DYNAMIC     Gi1\/0\/1\r\n   2    c89c.1d24.2ae2    DYNAMIC     Gi1\/0\/11\r\n   2    c89c.1d24.2ae5    DYNAMIC     Gi1\/0\/11\r\nTotal Mac Addresses for this criterion: 6\r\nsw02#\r\n<\/pre>\n<h3>SW02 : mac address-table \u4fdd\u6301\u6642\u9593<\/h3>\n<p>15:41:06.965 : SW02 \u5207\u308a\u66ff\u3048\u524d\u3092\u78ba\u8a8d\u3057\u305f\u6642\u523b<\/p>\n<p>15:41:07\u00a0 \u00a0 \u00a0 : SW01 Link Down \u6642\u523b<\/p>\n<p>15:41:07.726 : SW02 \u5207\u308a\u66ff\u3048\u3092\u78ba\u8a8d\u3057\u305f\u6642\u523b<\/p>\n<p>15:41:28.040\uff1aPing \u306e\u6700\u5f8c\u306ePacket\u9001\u4fe1\u6642\u523b<\/p>\n<p>15:41:34.256 : mac address-table \u304b\u3089\u524a\u9664\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u305f\u6642\u523b<\/p>\n<h3>Ping<\/h3>\n<pre>$ ping -c 300 -i 0.2 -w 0.8 192.168.202.2 | while read line; do echo `date +'%Y\/%m\/%d %H:%M:%S.%3N'` $line; done | tee -i pingt-linkup.log\r\n2020\/07\/11 15:40:27.915 PING 192.168.202.2 (192.168.202.2) 56(84) bytes of data.\r\n2020\/07\/11 15:40:27.917 64 bytes from 192.168.202.2: icmp_seq=1 ttl=255 time=1.43 ms\r\n2020\/07\/11 15:40:28.116 64 bytes from 192.168.202.2: icmp_seq=2 ttl=255 time=1.81 ms\r\n\u4e2d\u7565\r\n2020\/07\/11 15:41:27.840 64 bytes from 192.168.202.2: icmp_seq=299 ttl=255 time=2.23 ms\r\n2020\/07\/11 15:41:28.040 64 bytes from 192.168.202.2: icmp_seq=300 ttl=255 time=1.22 ms\r\n2020\/07\/11 15:41:28.042\r\n2020\/07\/11 15:41:28.044 --- 192.168.202.2 ping statistics ---\r\n2020\/07\/11 15:41:28.046 300 packets transmitted, 300 received, 0% packet loss, time 60125ms\r\n2020\/07\/11 15:41:28.049 rtt min\/avg\/max\/mdev = 0.670\/2.200\/25.403\/2.366 ms\r\n$\r\n<\/pre>\n<h2><a id=\"dummymulticastpacket\"><\/a>Dummy Multicast Packet<\/h2>\n<p>Dummy Multicast Packet \u306f Destination MAC Address = 01:00:0c:cd:cd:cd \u306e Packet \u3067\u3042\u308b\u3002<\/p>\n<p>Cisco IOS \u3067\u306f\u826f\u304f\u5229\u7528\u3055\u308c\u308b Packet \u3067\u3042\u308b\u3002<\/p>\n<p>SW01 \u3067Interface GigabitEthernet 1\/0\/1 \u304b\u3089 GigabitEthernet 1\/0\/2 \u3078\u306e\u5207\u308a\u66ff\u308a\u6642\u306ePacket\u3092Wireshark\u3067Capture\u3059\u308b\u3068\u4e0b\u8a18\u306ePacket\u304c\u8a18\u9332\u3055\u308c\u308b\u3002<\/p>\n<pre>No.     Time           Source                Destination           Protocol Length Port   Info\r\n     10 12.856470435   Cisco_bb:fc:c0        STP-UplinkFast        LLC      62            U, func=UI; SNAP, OUI 0x00000C (Cisco Systems, Inc), PID 0x0115\r\n     11 12.856471297   Cisco_bb:fc:c0        STP-UplinkFast        ARP      62            Unknown ARP opcode 0x0115\r\n     12 12.856473690   0115.fc               000c.bb               DDP      62     128    Unknown DDP protocol (17)\r\n     13 12.856473994   000f0000.000000000000 0115bbfc.808017000014 IPX      62     0x0002 CISCO PING\r\n     14 12.858636543   WistronI_2e:f9:93     STP-UplinkFast        LLC      62            U, func=UI; SNAP, OUI 0x00000C (Cisco Systems, Inc), PID 0x0115\r\n     15 12.858637225   WistronI_2e:f9:93     STP-UplinkFast        ARP      62            Unknown ARP opcode 0x0115\r\n     16 12.858637563   0115.00               000c.00               DDP      62     0      Unknown DDP protocol (00)\r\n     17 12.858978256   00000000.000000000000 01150000.000000000000 IPX      62     0x0000 Unknown (0x0000)\r\n<\/pre>\n<h3>Source MAC Address<\/h3>\n<ul>\n<li>c0:7b:bc:bb:fc:c0 : SW01 Interface Vlan1 MAC Address<\/li>\n<li>f0:de:f1:2e:f9:93 : PC NIC MAC Address<\/li>\n<\/ul>\n<h3>Protocol<\/h3>\n<ul>\n<li>LLC<\/li>\n<li>ARP<\/li>\n<li>DDP<\/li>\n<li>IPX<\/li>\n<\/ul>\n<h2><a id=\"result\"><\/a>Result<\/h2>\n<h3>Dummy Multicast Packet<\/h3>\n<p>SW02 \u3067 PC \u306e MAC Address \u3092 Source Address\u3068\u3059\u308b Dummy Multicast Packet \u3092\u53d7\u4fe1<\/p>\n<h3>mac address-table \u306b\u4fdd\u6301\u3055\u308c\u308b\u6642\u9593<\/h3>\n<p><strong>\u901a\u4fe1\u304c\u306a\u3044\u5834\u5408<\/strong><\/p>\n<p>PC \u306e MAC Address \u3092 Source Address \u3068\u3059\u308b\u901a\u4fe1\u304c\u7121\u3044\u5834\u5408\u3001SW02 \u306e mac address-table \u306f\u4e0a\u8a18\u3067\u5b66\u7fd2\u3057\u305f PC \u306e MAC Address \u309215\u79d2\u7a0b\u5ea6\u7dad\u6301\u3057\u305f\u5f8c\u306b mac address-table \u304b\u3089\u524a\u9664\u3055\u308c\u308b\u73fe\u8c61\u304c\u767a\u751f<\/p>\n<p><strong>\u901a\u4fe1\u304c\u3042\u308b\u5834\u5408<\/strong><\/p>\n<p>\u4e0a\u8a18\u306e\u671f\u9593\uff08\u6642\u9593\u5185\uff09\u306b\u901a\u4fe1\u304c\u3042\u308b\u5834\u5408 mac address-table \u306bPC \u306e MAC Address \u3092\u4fdd\u6301<\/p>\n<h2><a id=\"consideration\"><\/a>Consideration<\/h2>\n<h3>mac address-table \u306b\u4fdd\u6301\u3055\u308c\u308b\u6642\u9593<\/h3>\n<p>Dummy Multicast Packet \u3067\u5b66\u7fd2\u3057\u305f MAC Address \u3092\u4fdd\u6301\u3059\u308b\u6642\u9593\u4ee5\u4e0a\u306e\u9593\u9694\u304c\u3042\u308b\u901a\u4fe1\u306f Interface \u306e\u5207\u66ff\u306b\u3088\u3063\u3066\u901a\u4fe1\u304c\u5fa9\u5143\u3057\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n<p>\u4e0a\u8a18\u306e\u73fe\u8c61\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u9001\u4fe1\u5143 Host Device \u306e ARP Cache \u304c\u30af\u30ea\u30a2\u3055\u308c ARP Request(Broadcast) \u3092\u9001\u4fe1\u3059\u308b\u307e\u3067\u901a\u4fe1\u306f\u4e0d\u53ef\u3068\u306a\u308b\u3002<\/p>\n<p>Dummy Multicast Packet \u3067\u5b66\u7fd2\u3057\u305f MAC Address \u3092 mac address-table \u306e aging time \u306e\u6642\u9593\u4fdd\u6301\u3057\u306a\u3044\u7406\u7531\u306f\u4e0d\u660e\u3067\u3042\u308b\u3002<\/p>\n<h3>mac address-table move update transmit\/receive command<\/h3>\n<p>CiscoSystems\u793e\u306eDocument\u3084\u305d\u306e\u4ed6\u306eWeb\u30b5\u30a4\u30c8\u3067\u306f\u4e0b\u8a18\u306ecommand\u3092\u8a2d\u5b9a\u3059\u308b\u65e8\u306e\u8a18\u8f09\u304c\u3042\u308b\u304c\u3001\u672c\u691c\u8a3c\u3067\u306f\u7279\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u306a\u304f Dummy Multicast Packet \u3092\u9001\u53d7\u4fe1\u3057\u3066\u3044\u308b\u3002<\/p>\n<ul>\n<li>mac address-table move update transmit<\/li>\n<li>mac address-table move update receive<\/li>\n<\/ul>\n<h3>\u6a5f\u80fd\u5b9f\u88c5\u30fb\u5229\u7528<\/h3>\n<p>FlexLink \u306f CiscoSystems\u793e \u306e\u72ec\u81ea\u5b9f\u88c5\u306e\u6a5f\u80fd\u3067\u3042\u308b\u3002\u672c\u691c\u8a3c\u3067\u5229\u7528\u3057\u305f IOS \u3084\u6a5f\u5668\u4ee5\u5916\u3067\u540c\u69d8\u306e\u52d5\u4f5c\u3092\u3059\u308b\u306e\u304b\u306f\u4e0d\u660e\u3067\u3042\u308a\u3001\u5229\u7528\u3059\u308b Hardware \/ Software \u3067\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u3066\u5229\u7528\u3059\u308b\u3053\u3068\u3092\u63a8\u5968\u3059\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview CiscoSystems IOS \u306b\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b FlexLink \u306e\u52d5\u4f5c\u3092\u78ba\u8a8d\u3059\u308b\u3002 Reference Flex Link\u00a0(CiscoSystems) Flex Link Function Ci [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[118,102],"tags":[],"class_list":["post-92","post","type-post","status-publish","format-standard","hentry","category-ethernet","category-switch"],"_links":{"self":[{"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=\/wp\/v2\/posts\/92","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=92"}],"version-history":[{"count":3,"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=\/wp\/v2\/posts\/92\/revisions"}],"predecessor-version":[{"id":3860,"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=\/wp\/v2\/posts\/92\/revisions\/3860"}],"wp:attachment":[{"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=92"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=92"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rlab.cavtime.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=92"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}