MLAG + Rapid Spanning Tree(RSTP) - 2 -

概要

前回の続きでMLAG + RSTP環境で気になることを色々試してみます。

MLAG間でPriorityが異なる場合は?

f:id:silverstyle:20181112161353j:plain

SN2010-1がMasterの時にMaster側のPriorityを0に設定してみる。

SN2010-1 [mlag-domain: master] (config) # spanning-tree priority 0

SN2010-1のMpo1、Mpo2がDiscardingのままとなり、正常な状態に遷移しないままとなった。他のスイッチに関してはRoot Bridgeは以前のままの状態。

SN2010-1 [mlag-domain: master] (config) # show spanning-tree

Switch                     : ethernet-default
Spanning tree protocol rst : enabled
Spanning tree force version: 2

Root ID:
  Priority           : 0
  Address            : 00:00:5e:00:01:5d
  Bridge root        : yes
  Hello Time (sec)   : 2
  Max Age (sec)      : 20
  Forward Delay (sec): 15

Bridge ID:
  Priority           : 0
  Address            : 00:00:5e:00:01:5d
  Hello Time (sec)   : 2
  Max Age (sec)      : 20
  Forward Delay (sec): 15

L: Loop Inconsistent
R: Root Inconsistent
G: BPDU Guard Inconsistent

--------------------------------------------------------------------------
Interface         Role         Sts              Cost      Prio   Type
--------------------------------------------------------------------------
Mpo1              Designated   Discarding       1000      128    normal
Mpo2              Designated   Discarding       1000      128    normal
Po1000            Designated   Forwarding       100       128    edge
SN2010-2 [mlag-domain: standby] # show spanning-tree

Switch                     : ethernet-default
Spanning tree protocol rst : enabled
Spanning tree force version: 2

Root ID:
  Priority           : 0
  Address            : 50:6b:4b:8e:92:c0
  Cost               : 1000
  Port               : Mpo1
  Hello Time (sec)   : 2
  Max Age (sec)      : 20
  Forward Delay (sec): 15

Bridge ID:
  Priority           : 8192
  Address            : 00:00:5e:00:01:5d
  Hello Time (sec)   : 2
  Max Age (sec)      : 20
  Forward Delay (sec): 15

L: Loop Inconsistent
R: Root Inconsistent
G: BPDU Guard Inconsistent

--------------------------------------------------------------------------
Interface         Role         Sts              Cost      Prio   Type
--------------------------------------------------------------------------
Mpo1              Root         Forwarding       1000      128    normal
Mpo2              Alternate    Discarding       1000      128    normal
Po1000            Designated   Forwarding       100       128    edge
SN2010-3 [standalone: master] # show spanning-tree

Switch                     : ethernet-default
Spanning tree protocol rst : enabled
Spanning tree force version: 2

Root ID:
  Priority           : 0
  Address            : 50:6b:4b:8e:92:c0
  Bridge root        : yes
  Hello Time (sec)   : 2
  Max Age (sec)      : 20
  Forward Delay (sec): 15

Bridge ID:
  Priority           : 0
  Address            : 50:6b:4b:8e:92:c0
  Hello Time (sec)   : 2
  Max Age (sec)      : 20
  Forward Delay (sec): 15

L: Loop Inconsistent
R: Root Inconsistent
G: BPDU Guard Inconsistent

--------------------------------------------------------------------------
Interface         Role         Sts              Cost      Prio   Type
--------------------------------------------------------------------------
Eth1/22           Designated   Forwarding       200       128    normal
Po1               Designated   Forwarding       1000      128    normal
SN2010-4 [standalone: master] # show spanning-tree

Switch                     : ethernet-default
Spanning tree protocol rst : enabled
Spanning tree force version: 2

Root ID:
  Priority           : 0
  Address            : 50:6b:4b:8e:92:c0
  Cost               : 200
  Port               : Eth1/22
  Hello Time (sec)   : 2
  Max Age (sec)      : 20
  Forward Delay (sec): 15

Bridge ID:
  Priority           : 4096
  Address            : 50:6b:4b:8e:95:c0
  Hello Time (sec)   : 2
  Max Age (sec)      : 20
  Forward Delay (sec): 15

L: Loop Inconsistent
R: Root Inconsistent
G: BPDU Guard Inconsistent

--------------------------------------------------------------------------
Interface         Role         Sts              Cost      Prio   Type
--------------------------------------------------------------------------
Eth1/22           Root         Forwarding       200       128    normal
Po1               Designated   Forwarding       1000      128    normal