Monitoring Routes Originating from a BGP Neighbor After Application of Inbound Policy

Purpose

Display all routes that originate from the specified BGP neighbor after inbound policy is applied. Report whether the indirect next hop of a route is unreachable; if not, display the IGP cost to the indirect next hop.

The show ip bgp neighbors routes and show bgp ipv6 neighbors routes commands display similar information.

Action

To all routes that originate from the specified BGP neighbor after inbound policy is applied:

host1#show bgp ipv6 neighbors 12.12.12.12 routes
Local BGP identifier 11.11.11.11, local AS 400
  5 routes (200 bytes)
  5 destinations (360 bytes) of which 5 have a route
  5 routes selected for route table installation
  4 path attribute entries (608 bytes)
  Local-RIB version 33. FIB version 33.

Status codes: > best, * invalid, s suppressed, d dampened, r rejected,
              a auto-summarized

  Prefix               Peer           Next-hop            MED LocPrf Weight Origin
> 3ffe:0:1:1::/64      12.12.12.12    ::102.102.102.2       0    100      0 inc. 

Meaning

Table 40 lists the show bgp ipv6 neighbors routes command output fields.

Table 40: show bgp ipv6 neighbors routes Output Fields

Field Name

Field Description

Local BGP identifier

BGP router ID of the local router

local AS

Local autonomous system number

routes

Total number of routes stored in the BGP routing table and amount of memory consumed by routes. If several peers have advertised a route to the same prefix, all routes are included in this count.

destinations

Number of routes to unique prefixes stored in the BGP routing table and amount of memory consumed by routes. If several peers have advertised a route to the same prefix, only the best route is included in this count.

routes selected for route table installation

Number of routes in the BGP routing table that have been inserted into the IP routing table, plus prefixes for which there are currently no routes but which have had to be withdrawn from peers to which these prefixes may been previously advertised.

path attribute entries

Number of distinct path attributes stored in BGP's internal path attributes table. If BGP receives two routes for different prefixes but with identical path attributes, BGP will create only one entry in its internal path attribute table and share it between the two routes to conserve memory.

Local-RIB version

Number that is increased by one each time a route in that RIB is added, removed or modified.

FIB version

Number that is increased by one each time BGP updates the routes in the IP routing table based on changes in the local RIB. The FIB version matches the local-RIB version when BGP has finished updating the routes in the IP route table. The FIB version is less than the local-RIB version when BGP is still in the process of updating the IP routing table.

Prefix

Prefix for the routing table entry

Peer

IP address of BGP peer

Next hop

IP address of the next hop

MED

Multiexit discriminator for the route

LocPrf

Local preference for the route

Weight

Assigned path weight

Origin

Origin of the route

Related Documentation