peer exp-mode (BGP-VPN instance IPv4 address family view)

Function

The peer exp-mode command specifies the mode in which a BGP label inherits the QoS priority in the outer tunnel label carried in packets.

The undo peer exp-mode command restores the default mode.

The default QoS priority inheriting mode varies according to the outer MPLS tunnel type:

LDP: By default, the BGP label inherits the QoS priority carried in the outer MPLS tunnel label.
TE: By default, the BGP label does not inherit the QoS priority carried in the outer MPLS tunnel label.
LDP over TE: By default, the BGP label inherits the QoS priority carried in the outer MPLS tunnel label.

Format

peer peerIpv4Addr exp-mode { pipe | uniform }

undo peer peerIpv4Addr exp-mode

Parameters

Parameter	Description	Value
peerIpv4Addr	Specifies the IPv4 address of a BGP peer.	The value is in dotted decimal notation.
pipe	Allows the BGP label to use its own QoS priority.	-
uniform	Allows the BGP label to inherit the QoS priority carried in the outer MPLS tunnel label.	-

Parameter

Description

Value

peerIpv4Addr

Specifies the IPv4 address of a BGP peer.

The value is in dotted decimal notation.

pipe

Allows the BGP label to use its own QoS priority.

uniform

Allows the BGP label to inherit the QoS priority carried in the outer MPLS tunnel label.

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

In a CSC(Carrier Support Carrier) scenario, each packet arriving at a PE carries an inner private label, a BGP LSP label, and an outer MPLS tunnel label. The PE remove outer MPLS tunnel labels from packets before sending the packets to each other. If the BGP LSP label in a packet carries a QoS priority different from that in the outer MPLS tunnel label in the packet, run the peer exp-mode command on the PE to determine whether the BGP LSP label inherits the QoS priority carried in the outer MPLS tunnel label to be removed.

Example

# Allow the BGP label to inherit the QoS priority carried in the outer MPLS tunnel label.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vpna
[*HUAWEI-vpn-instance-vpna] ipv4-family
[*HUAWEI-vpn-instance-vpna-af-ipv4] route-distinguisher 1:1
[*HUAWEI-vpn-instance-vpna-af-ipv4] quit
[*HUAWEI-vpn-instance-vpna] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] ipv4-family vpn-instance vpna
[*HUAWEI-bgp-vpna] peer 1.2.3.4 as-number 100
[*HUAWEI-bgp-vpna] peer 1.2.3.4 exp-mode uniform