Configure Mpls Vlan Ip-Mtu - Extreme Networks ExtremeWare Command Reference Manual

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configure mpls vlan ip-mtu

configure mpls vlan [<vlan name> | all] ip-mtu <number>

Configures the IP MTU for frames transmitted onto MPLS LSPs via the specified egress VLAN. The

range is 42 to 9190(using jumbo frame sizes).

Syntax Description

Usage Guidelines

This command configures the IP MTU for frames transmitted onto MPLS LSPs via the specified egress

VLAN. The default settings is 1500 bytes. If

MPLS-enabled VLANs.

This command applies to the ingress LSR only when a received IP packet is destined for an MPLS LSP.

In this case, if the length of the IP packet exceeds the configured MTU size for the egress VLAN and the

Don't Fragment (DF) bit is not set in the IP header of the packet, the packet is fragmented before it is

forwarded onto an MPLS LSP. If the DF bit is set in the packet header, Path MTU Discovery starts.

Fragmentation is based on either the minimum value of the configured MPLS IP MTU size or the

configured IP MTU size for the egress VLAN. (The IP MTU size is configured using the

ip-mtu <number> vlan <vlan name>

Configure the MPLS IP MTU so that the addition of the MPLS label stack the link layer header does not

cause the packet to be too large to be transmitted on the egress ports. To avoid potential problems,

enable jumbo frame support on all ports that are members of an MPLS VLAN.

The following command configures the IP MTU for frames transmitted onto MPLS LSPs:

configure mpls vlan vlan1 ip-mtu 1550

This command was first available in an ExtremeWare IP Technology Services Release based on

This command was subsequently incorporated into ExtremeWare 7.0.0.

ExtremeWare Software 7.3.0 Command Reference Guide

Specifies a VLAN name.

Specifies all VLANs.

Specifies an IP MTU size.

is selected, the configuring MTU applies to all

configure mpls vlan ip-mtu

Extremeware 7.3.0