Connectivity Guide

Verify BFD for BGP
OS10(config-router-bgp-101)# show ip bgp summary
BGP router identifier 30.1.1.2 local AS number 101
Global BFD is enabled
Neighbor AS MsgRcvd MsgSent Up/Down State/Pfx
20.1.1.1 101 781 777 11:16:13 0
30.1.1.1 101 787 779 11:15:35 0
OS10(config-router-bgp-101)# show ip bgp neighbors
BGP neighbor is 20.1.1.1, remote AS 101, local AS 101 internal link
BGP version 4, remote router ID 30.1.1.1
BGP state ESTABLISHED, in this state for 11:19:01
Last read 00:24:31 seconds
Hold time is 180, keepalive interval is 60 seconds
Configured hold time is 180, keepalive interval is 60 seconds
Fall-over disabled
Neighbor is using Global level BFD Conguration
Received 784 messages
1 opens, 0 notifications, 0 updates
783 keepalives, 0 route refresh requests
Sent 780 messages
2 opens, 0 notifications, 0 updates
778 keepalives, 0 route refresh requests
Minimum time between advertisement runs is 30 seconds
Minimum time before advertisements start is 0 seconds
Capabilities received from neighbor for IPv4 Unicast:
MULTIPROTO_EXT(1)
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
4_OCTET_AS(65)
Capabilities advertised to neighbor for IPv4 Unicast:
MULTIPROTO_EXT(1)
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
4_OCTET_AS(65)
Prefixes accepted 0, Prefixes advertised 0
Connections established 1; dropped 0
Last reset never
For address family: IPv4 Unicast
Allow local AS number 0 times in AS-PATH attribute
Prefixes ignored due to:
Martian address 0, Our own AS in AS-PATH 0
Invalid Nexthop 0, Invalid AS-PATH length 0
Wellknown community 0, Locally originated 0
Local host: 20.1.1.2, Local port: 179
Foreign host: 20.1.1.1, Foreign port: 58248
BFD for OSPF
You can congure BFD to monitor and notify reachability status between OSPF neighbors. When you use BFD with OSPF, BFD sessions
are established between all neighboring interfaces participating with OSPF full state. If a neighboring interface fails, BFD noties OSPF
protocol that a link state change has occurred.
To congure BFD for OSPF:
1 Enable BFD Globally.
2 Congure OSPF on the interconnecting routers. For more information, see Open Shortest Path First (OSPFv2 and OSPFv3).
Layer 3
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