nexthop interface (sid-np-evpn IPv6)

Function

The nexthop interface command configures a device to allocate SIDs to BGP VPN IPv6 routes based on specified next hops.

The undo nexthop interface command restores the default configuration.

By default, a device is not configured to allocate SIDs to BGP VPN IPv6 routes based on next hops.

Format

nexthop nexthop-address interface { interface-name | interfaceType interfaceNum }

undo nexthop nexthop-address interface { interface-name | interfaceType interfaceNum }

Parameters

Parameter	Description	Value
nexthop-address	Allocates SIDs based on the IPv6 address of a specified next hop.	The value is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X.
interface-name	Specifies an interface name.	-
interfaceType	Specifies an interface type.	-
interfaceNum	Specifies an interface number.	-

Views

sid-np-evpn view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

In an EVPN L3VPNv6 over SRv6 BE/SRv6 TE Policy scenario, to properly use network resources and reduce network congestion, run the nexthop interface command to allocate SIDs to BGP VPN IPv6 routes based on specified next hops. This configuration helps implement SID-based load balancing.

Precautions

The outbound interface specified by the nexthop interface command must be the same as the actual forwarding outbound interface. If they are different, the outbound interface specified by the command is used for service forwarding, which may cause a forwarding failure.
If the nexthop interface command and the opcode end-dx6 vpn-instance evpn command specify the same next-hop address but different outbound interfaces, the outbound interface specified by the opcode end-dx6 vpn-instance evpn command is used for service forwarding.
If dynamic SIDs cannot be allocated to BGP VPN IPv6 routes based on next hops due to the insufficiency of configured dynamic SID resources, SIDs are allocated to routes based on instances, leading to a failure of SID-based load balancing.

Example

# Specify the next-hop IP address and outbound interface name in the SID-NP-EVPN view.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance v
[*HUAWEI-vpn-instance-v] ipv6-family
[*HUAWEI-vpn-instance-v-af-ipv6] route-distinguisher 1:1
[*HUAWEI-vpn-instance-v-af-ipv6] quit
[*HUAWEI-vpn-instance-v] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] ipv6-family vpn-instance v
[*HUAWEI-bgp-6-v] segment-routing ipv6 locator 1 evpn
[*HUAWEI-bgp-6-v] segment-routing ipv6 apply-sid specify-nexthop evpn
[*HUAWEI-bgp-6-v-sid-np-evpn] nexthop 3::3 interface GigabitEthernet 0/1/1