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现场配置思科与华三S75E设备对接MSTP,发现即使通过优先级将华三S75E设备指定为根桥,思科设备上根桥状态不会改变。
现场配置:
spanning-tree mst configuration
instance 1 vlan 1-7
instance 2 vlan 8-12
instance 3 vlan 13-19, 22-239
instance 4 vlan 20, 240
instance 5 vlan 21, 241-1005
华三:
stp region-configuration
instance 1 vlan 1 to 7
instance 2 vlan 8 to 12
instance 3 vlan 13 to 19 22 to 239
instance 4 vlan 20 240
instance 5 vlan 21 241 to 1005
active region-configuration
#
stp instance 1 priority 4096
stp instance 2 priority 4096
stp instance 3 priority 4096
stp instance 4 priority 4096
stp instance 5 priority 4096
华三S75设备上的端口角色状态:
主核心:
<SDDL_GJW_H3C7503E>dis stp root
MST ID Root Bridge ID ExtPathCost IntPathCost Root Port
0 4096.38ad-8e2c-f600 18 0 BAGG2
1 0.38ad-8e2c-5800 0 0
2 0.38ad-8e2c-5800 0 0
3 0.38ad-8e2c-5800 0 0
4 0.38ad-8e2c-5800 0 0
5 0.38ad-8e2c-5800 0 0
<SDDL_GJW_H3C7503E>dis stp brief
MST ID Port Role STP State Protection
0 Bridge-Aggregation2 ROOT FORWARDING NONE
1 Bridge-Aggregation2 MAST FORWARDING NONE
2 Bridge-Aggregation2 MAST FORWARDING NONE
3 Bridge-Aggregation3 DESI FORWARDING NONE
4 Bridge-Aggregation2 MAST FORWARDING NONE
5 Bridge-Aggregation2 MAST FORWARDING NONE
备核心:
<SDDL_GJW_H3C7503E_2>dis stp root
MST ID Root Bridge ID ExtPathCost IntPathCost Root Port
0 4096.38ad-8e2c-f600 0 0
1 4096.38ad-8e2c-f600 0 0
2 4096.38ad-8e2c-f600 0 0
3 4096.38ad-8e2c-f600 0 0
4 4096.38ad-8e2c-f600 0 0
5 4096.38ad-8e2c-f600 0 0
<SDDL_GJW_H3C7503E_2>dis stp brief
MST ID Port Role STP State Protection
0 Bridge-Aggregation2 DESI FORWARDING NONE
1 Bridge-Aggregation2 DESI FORWARDING NONE
2 Bridge-Aggregation2 DESI FORWARDING NONE
3 Bridge-Aggregation2 DESI FORWARDING NONE
4 Bridge-Aggregation2 DESI FORWARDING NONE
5 Bridge-Aggregation2 DESI FORWARDING NONE
分析:
但是对于其他实例中端口却为MAST端口,说明S75已经是此MST域中的根桥了,但是因为S75和上层设备不在一个MST域所以会导致MAST角色出现。排查配置发现两台设备的MST域名不一致。
在思科和华三配置相同的MST域名和修订级别后问题解决,
思科:
spanning-tree mst configuration
name xxx
revision 1
instance 1 vlan 1-7
instance 2 vlan 8-12
instance 3 vlan 13-19, 22-239
instance 4 vlan 20, 240
instance 5 vlan 21, 241-1005
华三:
stp region-configuration
region-name xxx
revision-level 1
instance 1 vlan 1 to 7
instance 2 vlan 8 to 12
instance 3 vlan 13 to 19 22 to 239
instance 4 vlan 20 240
instance 5 vlan 21 241 to 1005
active region-configuration
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