peer ebgp-max-hop (BGP-VPN instance IPv4 address family view)

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 cancels the existing configuration.

By default, an EBGP connection can be set up only on a directly-connected physical link.

Format

peer ipv4-address ebgp-max-hop [ hop-count ]

undo peer ipv4-address ebgp-max-hop

Parameters

Parameter	Description	Value
ipv4-address	Specifies the IPv4 address of a peer.	The value is in dotted decimal notation.
hop-count	Specifies the maximum number of hops.	The value is an integer ranging from 1 to 255. By default, the maximum number of hops in an EBGP connection is 1. If the specified maximum number of hops is 1, EBGP connection cannot be established between non-directly connected devices. If hop-count is not specified in the peer ebgp-max-hop command, 255 is used as the maximum number of hops in EBGP connections.

Parameter

Description

Value

ipv4-address

Specifies the IPv4 address of a peer.

The value is in dotted decimal notation.

hop-count

Specifies the maximum number of hops.

The value is an integer ranging from 1 to 255. By default, the maximum number of hops in an EBGP connection is 1. If the specified maximum number of hops is 1, EBGP connection cannot be established between non-directly connected devices. If hop-count is not specified in the peer ebgp-max-hop command, 255 is used as the maximum number of hops in EBGP connections.

Views

BGP-VPN instance IPv4 address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

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.

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.

Example

# Allow indirectly connected EBGP peer with the IP address of to establish a connection with the local device.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vpn1
[*HUAWEI-vpn-instance-vpn1] ipv4-family
[*HUAWEI-vpn-instance-vpn1-af-ipv4] route-distinguisher 100:1
[*HUAWEI-vpn-instance-vpn1-af-ipv4] quit
[*HUAWEI-vpn-instance-vpn1] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] ipv4-family vpn-instance vpn1
[*HUAWEI-bgp-vpn1] peer 10.1.1.1 as-number 200
[*HUAWEI-bgp-vpn1] peer 10.1.1.1 ebgp-max-hop