Cisco XR 12000 Series User Manual

mtu (VPLS)
To adjust the maximum packet size or maximum transmission unit (MTU) size for the bridge domain, use
the mtu command in L2VPN bridge group bridge domain configuration mode. To disable this feature, use
the no form of this command.
mtu bytes
no mtu
Syntax Description
MTU size, in bytes. The range is from 46 to 65535.
bytes
Command Default
The default MTU value is 1500.
Command Modes
L2VPN bridge group bridge domain configuration
Command History
ModificationRelease
This command was introduced.Release 3.7.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
Each interface has a default maximum packet size or MTU size. This number generally defaults to the largest
size possible for that interface type. On serial interfaces, the MTU size varies, but cannot be set smaller than
64 bytes.
The MTU for the bridge domain includes only the payload of the packet. For example, a configured bridge
MTU of 1500 allows tagged packets of 1518 bytes (6 bytes DA, 6 bytes SA, 2 bytes ethertype, or 4 bytes
qtag).
Task ID
OperationsTask ID
read, writel2vpn
Examples
The following example specifies an MTU of 1000 bytes:
RP/0/0/CPU0:router# configure
RP/0/0/CPU0:router(config)# l2vpn
RP/0/0/CPU0:router(config-l2vpn)# bridge group 1
Cisco IOS XR Virtual Private Network Command Reference for the Cisco XR 12000 Series Router, Release 4.3.x
OL-28460-01 181
Virtual Private LAN Services Commands
mtu (VPLS)

Cisco XR 12000 Series Specifications

General

Brand	Cisco
Model	XR 12000 Series
Category	Network Router
Language	English