peer ebgp-max-hop
Function
The peer ebgp-max-hop command configures a BGP device to establish an EBGP peer relationship with a peer on an indirectly-connected network and set the maximum number of hops between the two devices.
The undo peer ebgp-max-hop command restores the default setting.
By default, an EBGP connection can be set up only on a directly-connected physical link.
Format
peer { group-name | ipv4-address | ipv6-address } ebgp-max-hop [ hop-count ]
undo peer { group-name | ipv4-address | ipv6-address } ebgp-max-hop
Parameters
| Parameter | Description | Value |
|---|---|---|
| group-name | Specifies the name of a peer group. | The name is a string of 1 to 47 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
| ipv4-address | Specifies the IPv4 address of a peer. | It is in dotted decimal notation. |
| ipv6-address | Specifies the IPv6 address of a peer. | The value is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X. |
| hop-count | Specifies the maximum number of hops. | The value is an integer that ranges from 1 to 255. The default value is 255. If the maximum number of hops is 1, a device cannot establish an EBGP connection with a peer on an indirectly-connected network. |
ipv4-address is valid only in the BGP view and BGP-VPN instance IPv4 address family view.
ipv6-address is valid only in the BGP view and BGP-VPN instance IPv6 address family view.
Views
BGP view, BGP-VPN instance IPv4 address family view, BGP-VPN instance IPv6 address family view
Usage Guidelines
Usage Scenario
A directly-connected physical link must be available between EBGP peers. Otherwise, the peer ebgp-max-hop command must be used to allow EBGP peers to establish a TCP connection over multiple hops.
If loopback interfaces are used to establish an EBGP peer relationship, the peer ebgp-max-hop command (hop-count ≥ 2) must be run; otherwise, the peer relationship cannot be established. If a one-hop EBGP peer relationship is established using loopback interface addresses, you can also run the peer connected-check-ignore command to establish an EBGP peer relationship.
Prerequisites
Peer relationships have been established using the peer as-number command.
Precautions
If the peer ebgp-max-hop command is used on one end of an EBGP connection, it must also be used on the other end.
The configurations of GTSM and EBGP-MAX-HOP affect the TTL values of sent BGP packets, and the configurations of the two functions are mutually exclusive.