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Cisco Bug: CSCtd31469 - A withdraw is not send for a vpnv4 prefix when the VRF is deleted

Last Modified

Mar 01, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(33)SB6a 12.2(33)SRD3

Description (partial)

Symptom:

A withdraw for a BGP vpnv4 prefix is not send after a VRF is deleted.


Conditions:

A VRF is deleted from a PE router.
Details:
This issue is related to import of locally sourced paths.
For the issue to occur the following are necessary conditions:
1) There must be 2 vrfs, VRF A and VRF B. 
2) VRF A has a locally sourced path, which
is redistributed by  RIP.
3) The redistributed sourced  path is imported to VRF B. 
4) VRF A advertises the locally sourced prefixes to RR and VRF B does not advertise
any prefixes to RR.
5) When vrfs are unconfigured, IGP deletes the routes.
6) The issue is seen if the importing vrf gets unconfigured before the exporting vrf  at this point.
7) If the exporting vrf gets unconfigured before importing vrf, the issue is not seen.

This issue is timing dependent, and has to fixed in ALL releases.
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Bug Details Include

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