[f-nsp] Spanning tree on brocade

[Nick Cutting]

Hi I am trying to document the spanning tree domain on a brocade environment that has both TurboIron-X24's and FCX-48G's

I'm traditionally a cisco guy so need some help in figuring out the show output of show span.

Right now we have a mix of rapid spanning tree and classic, I need help in understand which is the mac address of the root bridge, the root ports and the terminology used in the output.

For example - is the root ID a mac address and the vlan ID added in Hex? What is the designated bridge ? is this is the downstream switches bridge ID?

I can't seem to match the bridge ID and the Root ID to mac address tables on the switch - is anyone able to shed light on these relationships and describe what each of the terms means below?

I'm guessing the first 4 digits of the DES root and DES Bridge are the priorities in HEX


STP instance owned by VLAN 501

Global STP (IEEE 802.1D) Parameters:

VLAN Root             Root Root Prio Max He- Ho- Fwd Last     Chg  Bridge
 ID   ID              Cost Port rity Age llo ld  dly Chang    cnt  Address
                                Hex  sec sec sec sec sec
 501 61f5000d662f3f40 6    1    ffff 20  2   1   15  133406   770  748ef86b37cd

Port STP Parameters:

Port  Prio Path  State       Fwd    Design   Designated       Designated
Num   rity Cost              Trans  Cost     Root             Bridge
      Hex
1     80   2     FORWARDING  3      4        61f5000d662f3f40 ffff0024387826c0
2     80   2     BLOCKING    5      6        61f5000d662f3f40 ffff002438780e80
5     80   2     FORWARDING  1      6        61f5000d662f3f40 ffff748ef86b37cd
6     80   2     FORWARDING  4      6        61f5000d662f3f40 ffff748ef86b37cd
11    80   2     BLOCKING    7      6        61f5000d662f3f40 8000748ef8f81bc0
12    80   2     BLOCKING    5      6        61f5000d662f3f40 8000748ef8f80e40
13    80   2     FORWARDING  2      6        61f5000d662f3f40 ffff748ef86b37cd
14    80   2     FORWARDING  2      6        61f5000d662f3f40 ffff748ef86b37cd
15    80   2     FORWARDING  2      6        61f5000d662f3f40 ffff748ef86b37cd
16    80   2     FORWARDING  2      6        61f5000d662f3f40 ffff748ef86b37cd
17    80   2     FORWARDING  3      6        61f5000d662f3f40 ffff748ef86b37cd
18    80   0     DISABLED    0      0        0000000000000000 0000000000000000
19    80   2     FORWARDING  7      6        61f5000d662f3f40 ffff748ef86b37cd
20    80   2     FORWARDING  9      6        61f5000d662f3f40 ffff748ef86b37cd
21    80   2     FORWARDING  3      6        61f5000d662f3f40 ffff748ef86b37cd
22    80   2     FORWARDING  3      6        61f5000d662f3f40 ffff748ef86b37cd
23    80   2     BLOCKING    10     4        61f5000d662f3f40 ffff0024387826c0
24    80   2     BLOCKING    10     4        61f5000d662f3f40 ffff0024387826c0




Nick Cutting | Network Engineer | Architecture & Standards Team| Office: 203-742-7856 | Fax: 203-742-7890

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