Troubleshooting Inconsistently Advertised Routes from Gigabit Ethernet Interfaces

For direct routes on a LAN in a Layer 3 VPN, the Junos OS attempts to locate a CE router that can be designated as the next hop. If this cannot be done, advertised routes from Gigabit Ethernet interfaces are dropped.

In such instances:

• Use the static statement at the [edit routing-options] or [edit logical-systems logical-system-name routing-options] hierarchy levels in the VRF routing instance to a CE router on the LAN subnet, configuring the CE router as the next hop. All traffic to directly destinations on this LAN will go to the CE router. You can add two static routes to two CE routers on the LAN for redundancy.
• Configure the vrf-table-label statement at the [edit routing-instances routing-instance-name] hierarchy levels to map the inner label of a packet to a specific VRF routing table. This allows the examination of the encapsulated IP header to force IP lookups on the VRF routing instance for all traffic.

  Note: The vrf-table-label statement is not available for every core-facing interface; for example, channelized interfaces are not supported. See Filtering Packets in Layer 3 VPNs Based on IP Headers for information about support for the vrf-table-label statement over Ethernet and SONET/SDH interfaces.