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Note: The MTU check is automatically present for interfaces belonging to the main router. |
By default, the maximum transmission unit (MTU) check for routing instance is disabled on M-series routers (except the M320), and enabled for all T-series, and J-series routers.
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Note: The MTU check is automatically present for interfaces belonging to the main router. |
On M-series routers (except the M320 router) you can configure MTU path checks on the outgoing interface for unicast traffic routed on a virtual private network (VPN) routing and forwarding (VRF) routing instance. When you enable MTU check, the routing platform sends an Internet Control Message Protocol (ICMP) message when the size of a unicast packet traversing a VRF routing instance or virtual-router routing instance has exceeded the MTU size and when an IP packet is set to "do not fragment". The ICMP message uses the routing instance local address as its source address.
For an MTU check to work in a routing instance, you must include the vrf-mtu-check statement at the [edit chassis] hierarchy level and assign at least one interface containing an IP address to the routing instance.
To configure path MTU checks, do the following:
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