cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
11996
Views
0
Helpful
2
Replies

What does "PfxCt" mean in a BGP session?

admin_2
Level 3
Level 3

A "sh ip bgp sum" gives a session in a "PfxCt" state. The session does not come up but stays in this state. What does this mean?

2 Replies 2

Not applicable

Idle (PfxCt) - for prefix count over limit

It means that you've probably configured a maximum number

of prefix and you've reached such maximum number.

This may be due to a maximum prefix restriction set by your service provider.

Eg:

PE router config:

R7# sh run | s r b

router bgp 6501

no synchronization

bgp log-neighbor-changes

network 70.0.0.0

network 80.0.0.1 mask 255.255.255.255

neighbor 70.0.0.2 remote-as 6500

neighbor 70.0.0.2 soft-reconfiguration inbound

neighbor 70.0.0.2 maximum-prefix 15 restart 1

no auto-summary

Logs indicate:

*Jun  9 07:09:14.363: %BGP-3-MAXPFXEXCEED: Number of prefixes received from 70.0.0.2 (afi 0): 16 exceeds limit 15

Neighbor        V          AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd

70.0.0.2        4       6500      54      28        0    0    0 00:00:49 Idle (PfxCt)

a) You may reduce the number of prefixes advertised by using a distribute list or

b)Ask your provider to increase the limit.

Hope you find this helpful.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco