Connectrix MDS 系列 Cisco：ISL 彈跳不會變更 iInterface 上的時間，而是邏輯連接埠通道上的時間

本文說明如何解釋作為埠通道成員的ISL上的連結事件。

作為邏輯埠通道一部分的ISL介面在變動或重置後不會更新“上次更改”時間戳。

ISL 連接埠 fc3/1 是連接埠通道 200 的一部分，具有下列「最後變更」時間戳記。

mds9513(config-if)# show interface fc3/1
fc3/1 is trunking
  Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)
    Port WWN is xx:xx:xx:xx:xx:xx:xx:xx
    Peer port WWN is xx:xx:xx:xx:xx:xx:xx:xx
    Admin port mode is auto, trunk mode is on
    snmp link state traps are enabled
    Port mode is TE
    Port vsan is 10
    Speed is 4 Gbps
<Snip>
 Belongs to port-channel 200
    Trunk vsans (admin allowed and active) (10)
    Trunk vsans (up)                       (10)
    Trunk vsans (isolated)                 ()
    Trunk vsans (initializing)             ()
<Snip>
 Interface last changed at Sun Jul 19 20:24:36 2015

連接埠通道 200 輸出：

mds9513(config-if)# sh int po200
port-channel 200 is trunking
    Hardware is Fibre Channel
    Port WWN is xx:xx:xx:xx:xx:xx:xx:xx
    Admin port mode is auto, trunk mode is on
    snmp link state traps are enabled
    Port mode is TE
    Port vsan is 10
<Snip>
Member[1] : fc3/1
    Interface last changed at Sun Jul 19 20:24:36 2015

mds9513(config-if)# show clock
23:02:18.026 JST Mon Jul 20 2015

ISL 介面連結已關閉並重設，如下所示：

mds9513(config-if)# sh log last 10
2015 Jul 20 23:04:04 mds9513 %PORT-5-IF_TRUNK_DOWN: %$VSAN 10%$ Interface port-channel 200, vsan 10 is down (Gracefully shutdown)
2015 Jul 20 23:04:04 mds9513 %PORT-5-IF_DOWN_NONE: %$VSAN 10%$ Interface port-channel 200 is down (None)
2015 Jul 20 23:04:04 mds9513 %PORT-5-IF_DOWN_PORT_CHANNEL_MEMBERS_DOWN: %$VSAN 10%$ Interface port-channel 200 is down (No operational members)

個別 ISL 連接埠上的「上次變更」時間戳記未更新：

mds9513(config-if)# sh int fc3/1
fc3/1 is trunking
    Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)
    Port WWN is xx:xx:xx:xx:xx:xx:xx:xx
    Peer port WWN is xx:xx:xx:xx:xx:xx:xx:xx
    Admin port mode is auto, trunk mode is on
    snmp link state traps are enabled
    Port mode is TE
    Port vsan is 10
<Snip>
    Belongs to port-channel 200
 Trunk vsans (admin allowed and active) (10)
    Trunk vsans (up)                       (10)
    Trunk vsans (isolated)                 ()
   Interface last changed at Sun Jul 19 20:24:36 2015   ++++ No time change updated.

但是，邏輯連接埠通道 200「上次變更」時間戳記已更新：

mds9513(config-if)# sh int po200
port-channel 200 is trunking
    Hardware is Fibre Channel
    Port WWN is xx:xx:xx:xx:xx:xx:xx:xx
    Admin port mode is auto, trunk mode is on
    snmp link state traps are enabled
    Port mode is TE
    Port vsan is 10
    Speed is 4 Gbps
Trunk vsans (admin allowed and active) (10)
    Trunk vsans (up)                       (10)
    Trunk vsans (isolated)                 ()
Member[1] : fc3/1
    Interface last changed at Mon Jul 20 23:04:10 2015 ++++ Updated Last changed time.

這是根據設計運作。

Cisco 確認，一旦介面添加到埠通道，它就會成為埠通道的一部分，並組合成一個聚合邏輯鏈路實體。因此，應在邏輯連結 （連接埠通道） 實體上檢查「上次變更」時間戳記，而非實體 FC 介面。

個別連接埠變動僅記錄在「show logging log」輸出中