View - ADTRAN Support Community

Troubleshooting
Criteria for
selecting routes.
Policies applied
to routes.
Number of routes
matched by this
map entry.
NetVanta_4305#show route-map
route-map DEFAULT-ROUTE-IN, permit, sequence 10
Match clauses:
ip address (prefix-lists): DEFAULT
Set clauses:
local-preference 110
BGP Filtering matches: 7 routes
Policy routing matches: 0 packets 0 bytes
Redistribution Filtering matches: 0 routes
Figure 15. Viewing BGP Policies in a Route Map
The output shows how many routes have been matched to the route map. If the AOS device does not seem
to be filtering any routes, verify that the route map has been applied to the correct neighbor and as the
correct policy (inbound or outbound).
The following are useful tips to keep in mind when searching for misconfigurations in a route map:
• If attributes are to be applied to routes filtered by an inbound route map, the set commands must be
entered for the attributes in the same route map entry in which the match command is entered to select
permitted routes.
• If an entry does not include a match statement, then the policy in that entry will be applied to all routes.
• If an entry is being used to place a route in one or more communities with the set community command,
then the send-community standard command must be issued from BGP Neighbor Configuration
mode.
Other Common BGP Problems
After a BGP session has been opened and routes have been exchanged with neighbors, several problems
might arise:
• An ISP might refuse to accept the local router’s routes
• The local network is flooded with external traffic
• Routers are not defined in the correct communities
An ISP Router Refuses Local Routes.
Verify that the ISP allows the advertisement of private routes.
61200860L1-29.4E Copyright © 2012 ADTRAN, Inc. 81