Guidelines for BGP

Firewall Mode Guidelines

Does not support transparent firewall mode. BGP is supported only in routed mode.

Supports IPv6.

For BGP, the next hop IP address for the routes is the network IP address and not 0.0.0.0.
The system does not add route entry for the IP address received over PPPoE in the CP route table. BGP always looks into CP route table for initiating the TCP session, hence BGP does not form TCP session.

Thus, BGP over PPPoE is not supported.
To avoid adjacency flaps due to route updates being dropped if the route update is larger than the minimum MTU on the link, ensure that you configure the same MTU on the interfaces on both sides of the link.
BGP with PATH MTU (PMTU) can cause adjacency flaps if MTU discovery fails, especially with ECMP routing. Hence, be cautious while using BGP, PMTU, and ECMP as packet drops can occur if MTU discovery fails due to any reason.
The BGP table of the member unit is not synchronized with the control unit table. Only its routing table is synchronized with the control unit routing table.
When you configure a route-based site-to-site VPN using static or dynamic VTI interfaces, ensure that the value of the TTL hop is more than one if you use BGP as the routing protocol.