Enabling BGP to establish an EBGP session over multiple hops

To establish an EBGP session, two routers must have a direct physical link and use directly connected interfaces. If no direct link is available, you must use the peer ebgp-max-hop command to enable BGP to establish an EBGP session over multiple hops and specify the maximum hops.

When the BGP GTSM feature is enabled, two peers can establish an EBGP session after passing GTSM check, regardless of whether the maximum number of hops is reached.

To enable BGP to establish an indirect EBGP session (IPv4 unicast/multicast address family):

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter BGP instance view or BGP-VPN instance view.	Enter BGP instance view:bgp as-number [ instance instance-name ] Enter BGP-VPN instance view: bgp as-number [ instance instance-name ] ip vpn-instance vpn-instance-name	N/A
3. Enable BGP to establish an EBGP session to an indirectly connected peer or peer group and specify the maximum hop count.	peer { group-name \| ipv4-address [ mask-length ] } ebgp-max-hop [ hop-count ]	By default, BGP cannot establish an EBGP session to an indirectly connected peer or peer group.

To enable BGP to establish an indirect EBGP session (IPv6 unicast/multicast address family):

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter BGP instance view or BGP-VPN instance view.	Enter BGP instance view:bgp as-number [ instance instance-name ] Enter BGP-VPN instance view: bgp as-number [ instance instance-name ] ip vpn-instance vpn-instance-name	N/A
3. Enable BGP to establish an EBGP session to an indirectly connected peer or peer group and specify the maximum hop count.	peer { group-name \| ipv6-address [ prefix-length ] } ebgp-max-hop [ hop-count ]	By default, BGP cannot establish an EBGP session to an indirectly connected peer or peer group.

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