HP
HPE7-A06 · Question #60
Ever since a recent firewall change at your WAN/Internet edge, the BGP state in your VSX pair has not returned to Established. What should you check to restore BGP functionality at this site?
The correct answer is B. Confirm that appropriate TCP ports are still allowed. BGP uses TCP port 179 for peer communication. A firewall change could have blocked this port, preventing BGP from establishing its sessions. Always confirm TCP port 179 is permitted between BGP peers.
Troubleshooting and Optimization of Campus Access Switching
Question
Ever since a recent firewall change at your WAN/Internet edge, the BGP state in your VSX pair has not returned to Established. What should you check to restore BGP functionality at this site?
Options
- ARestart the routing service so that BGP auto-discovers its neighbors.
- BConfirm that appropriate TCP ports are still allowed.
- CRestart NAT service for the BGP interface.
- DConfirm that BGP Peer AS has not changed.
How the community answered
(42 responses)- A2% (1)
- B76% (32)
- C7% (3)
- D14% (6)
Explanation
BGP uses TCP port 179 for peer communication. A firewall change could have blocked this port, preventing BGP from establishing its sessions. Always confirm TCP port 179 is permitted between BGP peers.
Topics
#BGP#TCP ports#firewall#VSX
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