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• Enable soft-reconfiguration debug.
EXEC Privilege mode
debug ip bgp {ip-address | peer-group-name} soft-reconfiguration
To enhance debugging of soft reconfig, use the bgp soft-reconfig-backup command only when
route-refresh is not negotiated to avoid the peer from resending messages.
In-BGP is shown using the show ip protocols command.
The system displays debug messages on the console. To view which debugging commands are enabled,
use the show debugging command in EXEC Privilege mode.
To disable a specific debug command, use the keyword no then the debug command. For example, to
disable debugging of BGP updates, use no debug ip bgp updates command.
To disable all BGP debugging, use the no debug ip bgp command.
To disable all debugging, use the undebug all command.
Storing Last and Bad PDUs
The system stores the last notification sent/received and the last bad protocol data unit (PDU) received
on a per peer basis. The last bad PDU is the one that causes a notification to be issued.
In the following example, the last seven lines shown in bold are the last PDUs.
Example of the show ip bgp neighbor Command to View Last and Bad PDUs
Dell(conf-router_bgp)#do show ip bgp neighbors 1.1.1.2
BGP neighbor is 1.1.1.2, remote AS 2, external link
BGP version 4, remote router ID 2.4.0.1
BGP state ESTABLISHED, in this state for 00:00:01
Last read 00:00:00, last write 00:00:01
Hold time is 90, keepalive interval is 30 seconds
Received 1404 messages, 0 in queue
3 opens, 1 notifications, 1394 updates
6 keepalives, 0 route refresh requests
Sent 48 messages, 0 in queue
3 opens, 2 notifications, 0 updates
43 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)
Capabilities advertised to neighbor for IPv4 Unicast :
MULTIPROTO_EXT(1)
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
For address family: IPv4 Unicast
BGP table version 1395, neighbor version 1394
Prefixes accepted 1 (consume 4 bytes), 0 withdrawn by peer
Prefixes advertised 0, rejected 0, 0 withdrawn from peer
Connections established 3; dropped 2
204
Border Gateway Protocol IPv4 (BGPv4)