slimx
Joined: 28 Sep 2006
Posts: 1
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 Posted:
Thu Sep 28, 2006 11:33 am Post subject:
Not correct MSTP BPDU by Cisco 2950 |
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IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA8a, RELEASE SOFTWARE (fc1)
This switch send out not correct MSTP Bpdus.
While CIST information seems to be OK, MST Extension has another &
unknown format.
The MST extension length field in the Cisco BPDU is in the wrong location:
it occupies the same location as "MST config ID format selector" defined in the 802.1s.
It seems, that the 16 bytes configuration digest in the BPDU from Cisco
does not follow the recommendation of the 802.1s. They have different
values compared with those value shown in 802.1s
Mst extension of BPDU which sended by Cisco 2950:
MST Extension, Length: 0 (Malformed: number of MSTI messages!!! Must be 64)
MST Config ID format selector: 64
MST Config name:
MST Config revision: 0
MST Config digest: BB3B6C15EF8D089BB55ED10D24DF44DE
CIST Internal Root Path Cost: 2147483660
CIST Bridge Identifier: 34217 / 21:00:00:00:00:00
CIST Remaining hops: 20
The same problem was with cisco 3750. But it was solved after IOS change (C3750ME Software (C3750ME-I5-M), Version 12.2(25)SEG1). |
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