peer next-hop-invariable (BGP-EVPN address family view)

Function

The peer next-hop-invariable command enables a BGP EVPN speaker to keep the next hops of routes unchanged when the speaker advertises these routes to EBGP EVPN peers and to apply the original next hops of locally imported routes when the speaker advertises these routes to IBGP EVPN peers.

The undo peer next-hop-invariable command restores the default configuration.

By default, the function of keeping the next hops of routes unchanged is not enabled.

Format

peer peerIpv4Addr next-hop-invariable

undo peer peerIpv4Addr next-hop-invariable

Parameters

Parameter	Description	Value
peerIpv4Addr	Specifies the IPv4 address of a peer.	It is in dotted decimal notation.

Parameter

Description

Value

peerIpv4Addr

Specifies the IPv4 address of a peer.

It is in dotted decimal notation.

Views

BGP-EVPN address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

By default:

A BGP EVPN speaker changes the next hops of routes to the interface that it uses to establish EBGP EVPN peer relationships before advertising these routes to EBGP EVPN peers.
A BGP EVPN speaker changes the next hops of routes imported from EBGP EVPN to the interface that it uses to establish IBGP EVPN peer relationships before advertising these routes to IBGP EVPN peers.
An RR does not change the next hops of routes imported from IBGP EVPN when advertising these routes to IBGP EVPN peers.
A BGP EVPN speaker changes the next hops of routes to the interface that it uses to establish IBGP EVPN peer relationships before advertising these routes to IBGP EVPN peers.
In an inter-AS scenario where an EVPN Route Reflector (RR) is used, the peer next-hop-invariable command needs to be run on the RR to prevent the RR from modifying the Next_Hops of routes before advertising the routes to EBGP peers. This ensures that the remote PE recurses routes to the LSP destined for the local PE during traffic transmission.
In an EVPN VXLAN scenario, the peer next-hop-invariable command must be run if a device needs to advertise routes received from an EBGP EVPN peer to IBGP EVPN peers or advertise routes to EBGP EVPN peers.

Prerequisites

The specified peer has been enabled in the BGP-EVPN address family view.

Precautions

If a device needs to advertise routes to its IBGP peer, the peer next-hop-invariable and peer next-hop-local commands are mutually exclusive on the device.

Example

# Configure a BGP device not to change the Next_Hop of a route when the BGP device advertises it to its EBGP peer in the BGP-EVPN address family view.

<HUAWEI> system-view
[~HUAWEI] bgp 100
[*HUAWEI-bgp] peer 1.1.1.9 as-number 200
[*HUAWEI-bgp] l2vpn-family evpn
[*HUAWEI-bgp-af-evpn] peer 1.1.1.9 enable
[*HUAWEI-bgp-af-evpn] peer 1.1.1.9 next-hop-invariable