Monitoring the BGP Routing Table

Purpose

Display the BGP IPv4 routing table or BGP IPv6 routing table.

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

Action

To display information about routes in the IPv6 multicast address family:

host1#show bgp ipv6 multicast
Local BGP identifier 10.13.13.13, local AS 400
  4 routes (160 bytes)
  4 destinations (288 bytes) of which 4 have a route
  4 routes selected for route table installation
  3 path attribute entries (456 bytes)
  Local-RIB version 31. FIB version 31.
 
Status codes: > best, * invalid, s suppressed, d dampened, r rejected,
              a auto-summarized
 
  Prefix                  Peer            Next-hop               MED  LocPrf   Weight  Origin
  ::103.103.103.0/120     103.103.103.3   ::103.103.103.3        0             0       inc.   
> 3ffe:0:0:1::/64         11.11.11.11     ::101.101.101.1        0    100      0       inc.   
> 3ffe:0:0:3::/64         103.103.103.3   ::103.103.103.3        0             0       inc.   
> 3ffe:0:1:1::/64         12.12.12.12     ::102.102.102.2        0    100      0       inc.   

To display information about routes for the specified IPv4 prefix:
host1:pe1#show ip bgp 10.88.88.1
BGP route information for prefix 10.88.88.1/32
  Network route (best route
    Advertised to both internal and external peers
    Address Family Identifier (AFI) is ip-v4
    Subsequent Address Family Identifier (SAFI) is unicast
    Next hop IP address is 0.0.0.0 (metric 2)
    Multi-exit discriminator is 1
    Local preference is not present
    Weight is 32768
    Origin is IGP
    AS path is empty
    Extended communities empty
To display information about routes for the specified IPv6 prefix:
host1:pe1#show bgp ipv6 2001:0430::1/128

BGP route information for prefix 2001:1::1/128
  Received route learned from internal peer 2.2.2.2 (best route)
    Route placed in IP forwarding table
    Best to advertise to external peers
    Address Family Identifier (AFI) is ip-v6
    Subsequent Address Family Identifier (SAFI) is unicast
    MPLS in-label is none
    MPLS out-label is 17
    Next hop IP address is ::ffff:2.2.2.2 (metric 3)
    Multi-exit discriminator is 0
    Local preference is 100
    Weight is 0
    Origin is IGP
    AS path is 65021
To display information about next hop routers for VRF PE 11
in the IPv4 VPN address family:
host1:pe1#show ip bgp vpnv4 vrf pe11 next-hops
Indirect next-hop 11.11.11.2
    Resolution in IP route table of VR pe11
Reachable (metric 0)
IP indirect next-hop index 35
Direct next-hop ATM2/0.11 (11.11.11.2)
    Resolution in IP tunnel-route table of VR pe11
        Not reachable
      Reference count is 1

Indirect next-hop 2.2.2.2
    Resolution in IP route table of VR pe1
IP indirect next-hop index 123
Reachable (metric 100)
    Direct next-hop POS4/0 (10.10.10.1)
                POS4/1 (12.12.12.1)

Resolution in IP tunnel-route table of VR pe1
MPLS indirect next-hop index 578
Reachable (metric 100)
    Direct next-hop Push 23, POS4/0 (10.10.10.1)
                Push 43, POS4/1 (12.12.12.1)

Reference count is 1
To display information about routes in the route-target address
family:
host1:pe1#show ip bgp route-target signaling
Local BGP identifier 13.13.13.13, local AS 100
  4 routes (240 bytes)
  3 destinations (228 bytes) of which 3 have a route
  3 routes selected for route tables installation
  0 unicast/multicast routes selected for route table installation
  0 unicast/multicast tunnel-usable routes selected for route table installation
  0 tunnel-only routes selected for tunnel-route table installation
  10 path attribute entries (1520 bytes)
  Local-RIB version 19. FIB version 19.
Status codes: > best, * invalid, s suppressed, d dampened, r rejected,
              a auto-summarized
  Prefix             Peer            Next-hop         MED LocPrf Weight Origin
> 0:0:0/0            12.12.12.12     12.12.12.12             100      0 IGP
> 100:100:1/96       11.11.11.11     11.11.11.11             100      0 IGP
  100:100:1/96       14.14.14.14     14.14.14.14             100      0 IGP
> 100:100:2/96       11.11.11.11     11.11.11.11             100      0 IGP

To display information about routes in the route-target address
family corresponding to the specified RT-MEM-NLRI:
host1:pe1#show ip bgp route-target signaling 100:100:1/96
BGP route information for prefix 100:100:1/96
  Received route learned from internal peer 11.11.11.11 (best route)
    Route not placed in IP forwarding table
    Best to advertise to both internal and external peers
    Address Family Identifier (AFI) is ip-v4
    Subsequent Address Family Identifier (SAFI) is route-target-signaling
    Next hop IP address is 11.11.11.11 (metric 0)
    Multi-exit discriminator is not present
    Local preference is 100
    Weight is 0
    Origin is IGP
    AS path is empty
  Received route learned from internal peer 14.14.14.14
    Route not placed in IP forwarding table
    Do not advertise to any peers
    Address Family Identifier (AFI) is ip-v4
    Subsequent Address Family Identifier (SAFI) is route-target-signaling
    Next hop IP address is 14.14.14.14 (metric 0)
    Multi-exit discriminator is not present
    Local preference is 100
    Weight is 0
    Origin is IGP
    AS path is empty
To display information about network routes in the route-target
address family:
host1:pe1#show ip bgp route-target signaling network
Prefix             Weight Route-map                        Backdoor
102:111:34/96                                              No
1111111111:23:1/96                                         No
To display information about network routes in the route-target
address family corresponding to the specified RT-MEM-NLRI:
host1:pe1#show ip bgp route-target signaling network 102:111:34
Prefix             Weight Route-map                        Backdoor
102:111:34/96                                              No
To display filtered information about all networks in the BGP
routing table:
host1:pe1#show ip bgp fields peer next-hop next-hop-cost
Prefix             Peer            Next-hop      Next-hop-cost
11.11.11.11/32     3.3.3.3         3.3.3.3       Unreachable
11.11.11.11/32     4.4.4.4         4.4.4.4       Unreachable
22.22.22.22/32     3.3.3.3         3.3.3.3       Unreachable
22.22.22.22/32     4.4.4.4         4.4.4.4       Unreachable
33.33.33.33/32     3.3.3.3         3.3.3.3       Unreachable
44.44.44.44/32     4.4.4.4         4.4.4.4       Unreachable
55.55.55.55/32     0.0.0.0         0.0.0.0       0
66.66.66.66/32     6.6.6.6         6.6.6.6       Unreachable
77.77.77.77/32     57.57.57.7      57.57.57.7    1
88.88.88.88/32     57.57.57.7      57.57.57.7    1
To display filtered information about routes that are stale
due to peer restart:
host1:pe1#show ip bgp fields best peer next-hop stale
Prefix             Stale Peer            Next-hop
10.22.22.1/32      stale 10.12.12.2      10.12.12.2
10.22.22.2/32      stale 10.12.12.2      10.12.12.2
10.22.22.3/32      stale 10.12.12.2      10.12.12.2
10.33.33.1/32            10.13.13.3      10.13.13.3
10.33.33.2/32            10.13.13.3      10.13.13.3
10.33.33.3/32            10.13.13.3      10.13.13.3 
To display introductory information about BGP attributes:
host1:pe1#show ip bgp 0.0.0.0 /0 fields intro
Local BGP identifier 192.168.254.79, local AS 6730
  201058 routes (12063492 bytes)
  201540 destinations (15317040 bytes) of which 201058 have a route
  193909 routes selected for route tables installation
  0 unicast/multicast routes selected for route table installation
  0 unicast/multicast tunnel-usable routes selected for route table     installation
  0 tunnel-only routes selected for tunnel-route table installation
  35097 path attribute entries (5334744 bytes)
  Local-RIB version 20969483. FIB version 20969483.
  Statistics baseline set WED JUL 12 2006 10:31:53 METDST
  ...
To display all routes with a prefix that is equal to or more
specific than the specified prefix:
host1#show ip bgp 12.2.0.0 255.255.0.0 longer-prefixes
Local router ID 192.168.1.153, local AS 100
  72074 paths, 72074 distinct prefixes (5189328 bytes used)
  72074 paths selected for route table installation
  21685 path attribute entries (2965327 bytes used)

  Prefix         Peer       Next-hop   MED CalPrf  Weight  Origin
> 12.2.6.0/24    10.5.0.48  10.5.0.48    100         100     IGP
> 12.2.7.0/24    10.5.0.48  10.5.0.48    100         100     IGP
> 12.2.76.0/24   10.5.0.48  10.5.0.48    100         100     IGP
> 12.2.88.0/22   10.5.0.48  10.5.0.48    100         100     IGP
> 12.2.97.0/24   10.5.0.48  10.5.0.48    100         100     IGP
> 12.2.99.0/24   10.5.0.48  10.5.0.48    100         100     IGP
> 12.2.109.0/24  10.5.0.48  10.5.0.48    100         100     IGP
> 12.2.169.0/24  10.5.0.48  10.5.0.48    100         100     IGP
Meaning
 Table 25 lists the show ip bgp command output fields.
Table 25:   show
ip bgp 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
Peer from which route was learned
Next hop IP address
IP address of the next router that is used when a packet
is forwarded to the destination network
MED
Multiexit discriminator for the route
LocPrf
Local preference for the route
Weight
Weight of the route
Origin
Origin of the route
AS path
AS path through which this route has been advertised
Communities
Community number associated with the route
Stale
Routes that have gone stale due to peer restart
unicast/multicast routes selected for route table installation
Number of unicast routes in the BGP routing table that
have been inserted into the IP routing table that are also available
for use in the multicast view of the IP routing table
unicast/multicast tunnel-usable routes selected for route
table installation
Number of unicast and multicast routes in the BGP routing
table that have been inserted into the IP routing table that are also
available for use in the IP tunnel routing table
tunnel-only routes selected for tunnel-route table installation
Number of routes in the BGP routing table that have been
inserted into the IP tunnel routing table
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.
Statistics baseline set
Timestamp indicating when the statistics baseline was
last set
Route-map
Indicates whether network-route filtering is enabled
Backdoor
Indicates whether an IGP backdoor route is favored over
an EBGP route
CalPrf
Calculated  preference
Related Documentation

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