ipv6 mtu (BNG)
To set the maximum transmission unit (MTU) size of IPv6 packets sent on an interface, use the ipv6 mtu
command in an appropriate configuration mode. To restore the default MTU size, use the no form of this
command.
ipv6 mtu bytes
no ipv6 mtu
Syntax Description
MTU in bytes. Range is 1280 to 65535 for IPv6 packets. The maximum MTU size that
can be set on an interface depends on the interface medium.
bytes
Command Default
If no MTU size is configured for IPv6 packets sent on an interface, the interface derives the MTU from the
Layer 2 MTU.
Command Modes
Interface configuration (not applicable for BNG)
Dynamic template configuration (for BNG)
Command History
ModificationRelease
This command was introduced.Release 3.7.2
This command was supported in the dynamic template configuration
mode for BNG.
Release 4.3.0
Usage Guidelines
If an IPv6 packet exceeds the MTU set for the interface, only the source router of the packet can fragment it.
The maximum MTU size that can be set on an interface depends on the interface medium. If the Layer 2 MTU
is smaller than the Layer 3 MTU, the Cisco IOS XR software uses the Layer 2 MTU value for the Layer 3
MTU. Conversely, If the Layer 3 MTU is smaller than the Layer 2 MTU, the software uses Layer 3 MTU
value. In other words the Cisco IOS XR software uses the lower of the two values for the MTU.
All devices on a physical medium must have the same protocol MTU to operate.
For BNG, ensure you run this command in the dynamic template configuration mode. To enter the dynamic
template configuration mode, run dynamic-template command in the Global Configuration mode.
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Command Reference,
Release 5.2.x
308
IPv4 and IPv6 Commands
ipv6 mtu (BNG)
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