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Adding Entries to the Existing ACL Did Not Reflect Changes to its BGP Peer



Article ID: KB6861 KB Last Updated: 13 Aug 2010Version: 4.0
Adding Entries to the Existing ACL Did Not Reflect Changes to its BGP Peer
  • Route Map to match an ACL on Cisco router
  • If any of route matches ACL, router will change MED value
  • bgp always-compare-med soft reset
Symptoms & Errors:
  • When route is added to ACL, NetScreen doesn't send BGP updates to BGP peer to reflect MED value changes
  • Adding entries to an existing ACL do not reflect changes to its BGP Peer

Cisco routers have a feature called soft reset, which changes the MED value in the BGP session table.  However, the NetScreen device does not support this.  If you have a Cisco router with soft reset enabled, and you add an entry in the NetScreen to an existing ACL, the NetScreen device will not send any BGP updates to the BGP peer.  The workaround is to configure the following:

unset vrouter <vrouter> protocol bgp enable
set vrouter <vrouter> protocol bgp enable

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