Connectrix MDS 系列 Cisco：ISL 退回不会更改 iInterface 上的时间，而是更改逻辑端口通道上的时间

本文介绍如何解释属于端口通道成员的 ISL 上的链路事件。

作为逻辑端口通道一部分的 ISL 接口在摆动或重置后不会更新“上次更改”时间戳。

ISL 端口 fc3/1 是端口通道 200 的一部分，具有以下“上次更改”时间戳。

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

端口通道 200 输出：

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 接口链路已关闭并重置，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)

单个 ISL 端口上的“上次更改”时间戳不会更新：

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，逻辑端口通道 200“上次更改”时间戳会更新：

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.

这是设计的本意。

Cisco 确认，将接口添加到端口通道后，它将成为端口通道的一部分，并合并为一个聚合逻辑链路实体。因此，应在逻辑链路（端口通道）实体上检查“上次更改”时间戳，而不是在物理 FC 接口上检查。

各个端口摆动仅记录在“show logging log”输出中。