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Cisco Bug: CSCur34335 - Bridge domain entries not deleted properly in l2fib

Last Modified

Apr 07, 2015

Products (16)

  • Cisco IOS
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
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Known Affected Releases

15.5(1)S

Description (partial)

Symptom:
After configuring trunk EFP with bridge-domain, if the vlan list is changed, bridge domain entries may not cleaned up properly in L2FIB.
Here is an example:
1- Configure trunk EFP with bridge domain:
<CmdBold>
conf t
interface ethernet 0/2
service instance trunk 1 ethernet
encapsulation dot1q 1-4
rewrite ingress tag pop 1 symmetric
bridge-domain from-encapsulation
end
<noCmdBold>

2- Change the vlan list:

<CmdBold>
conf t
interface ethernet 0/2
service instance trunk 1 ethernet
no encapsulation dot1q 1-3
encapsulation dot1q 4-5
rewrite ingress tag pop 1 symmetric
bridge-domain from-encapsulation
end
<noCmdBold>

3- Check the command <CmdBold> show l2fib bridge-domain summary <noCmdBold> to find that the list of bridge domains in L2FIB may not match what is in running config.

Conditions:
To recreate the problem, one should:
1- Remove low vlan values and add higher values. In the example above, vlans 1 to 3 have been replaced by higher vlan values 4 to 5. If the opposite was done (i.e. replacing higher values 4-5 with lower values 1-3) the issue may not be seen.
2- Quickly remove and add vlan values. This issue is time sensitive. In the example above, we could hit the issue only if we paste remove and addition is one shot/.
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Bug Details Include

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  • Status
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