Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 610)

FIGURE 69 VRF topology
OSPF VRF-Lite for customer-edge routers
A customer edge (CE) router acts as the provider edge (PE) router in VRF-Lite. When a type 3, 5, or 7
link-state advertisement (LSA) is sent from a PE router running multiprotocol BGP to a CE router, the
DN (down) bit in the LSA options field must be set. This prevents any type 3, 5, or 7 LSA messages
sent from the CE router to the PE router from being distributed any farther. The PE router ignores
messages with the DN bit set and does not add these routes to the VRF (Virtual Routing and
Forwarding) routing table.
Configuring VRF
NOTE
The following configuration gives an example of a typical VRF-Lite use case and is not meant to give
an ideal configuration.
The examples in this section are based on the VRF topology on page 609 and use the OSPF routing
protocol.
Refer to the Network OS Command Reference for detailed information on VRF commands.
The following example enables routing and configures VRF on the "orange" edge router. If you want to
match the VRF topology diagram, you can repeat the steps here to configure the "green" edge router.
1. Enter RBridge ID configuration mode.
switch(config)# rbridge-id 1
2. Set up the VRF instance.
OSPF VRF-Lite for customer-edge routers
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