Few advertised BGP routes are not installed on Firewall
12273
Created On 06/08/22 09:42 AM - Last Modified 07/23/22 04:02 AM
Symptom
Firewall installs lesser routes compared to the routes advertised by the peer.
Network Configuration
- Router --------BGP ----- firewall
- Router advertises more than 5100 routes but the firewall installs less than 5000 routes.
Environment
- Palo Alto Firewalls
- Supported PAN-OS
- BGP configured with neighbor router
Cause
The total prefixes received exceeds the maximum number of prefixes configured to receive from neighbor .
Resolution
- Check the messages in the routed.log (less mp-log routed.log). In this case the defined maximum prefixes is 5000.
**** AUDIT 0x4107 - 16 (0000) **** I:0050ff25 F:00000002
qbdcphs1.c 1437 :at 20:49:36, 22 February 2022 (727892719 ms)
The maximum number of prefixes stored for a neighbor would be exceeded.
RIB Manager entity index: 0X00000001
Neighbor IP address: <peer-ip>
AFI: 1
SAFI: 1
Defined max prefixes: 5000
Dropping connection: False
Idle hold time: 90
- The command "show routing fib" and " show routing protocol bgp peer peer-name <peer>" also shows these details
Firewall> show routing fib
total virtual-router shown : 1
--------------------------------------------------------------------------------
virtual-router name: default
interfaces:
ethernet1/3 ethernet1/6
route table:
flags: u - up, h - host, g - gateway, e - ecmp, * - preferred path
maximum of fib entries for device: 5000
........
Firewall> show routing protocol bgp peer peer-name <name>
Peer: <name>
virtual router: default
Peer router id: 0.0.0.0
Remote AS: 1234
Peer group: Pgroup (id 30)
Peer status: Connect, for 0 seconds
Password set: no
Passive: no
Multi-hop TTL: 1
Remote Address: 172.20.97.2
Local Address: 172.20.97.1
(R) reflector client: not-client
same confederation: no
send aggr confed as-path: yes
peering type: Unspecified
Connect-Retry interval: 1
Open Delay: 0
Idle Hold: 15
Prefix limit: 5000
Holdtime: 0 (config 90)
Keep-Alive interval: 0 (config 30)
Update
....
- Go to GUI: Network > Virtual Routers > (name) > BGP > Peer Group > (name) > (Select the peer) > Advanced
- Increase the Max Prefixes to the desired value from maximum of 5000.
- Commit the Configuration.