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Cisco Bug: CSCvu60708 - MPLS VPNv4 Traffic Does Not Adhere To MTU Configured On Tunnel Interface

Last Modified

Jul 17, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

When "mpls ip" is configured on a tunnel interface, VPNv4 learned subnet VRF traffic does not follow the MTU configured on that tunnel interface.  Traffic that is routed within the global routing table (non-MPLS VPNv4 learned VRF traffic) follows the MTU configured on the tunnel interface as expected.

1. Configure tunnel interface with "mpls ip" and "mtu [#]" commands
2. Share VPNv4 VRF subnets via MPLS/BGP over the tunnel
3. Hosts within MPLS VPNv4 subnets will be able to successfully communicate at MTUs higher than configured on the tunnel interface
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