Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 401)

Multi-Service IronWare Routing Configuration Guide 373
53-1003033-02
Configuring Multi-VRF
FIGURE 26 Example network topology with both RED and GREEN VPNs
In the diagram in Figure 26 , CE1 and CE4 are customer edge (CE) routers for the “green” VPN,
while CE2 and CE3 belong to “red” VPN. These CE routers can be any routers or layer 3 switches
that are capable of running one or many dynamic routing protocols such as BGP, OSPF or RIP or
even simple static routing.
The 2 PEs routers have to be routers that are capable of supporting VRF routing (either with or
without MPLS support). In this example, we use two Brocade Brocade NetIron XMR devices. They
connect all four CE routers together with a single link between the two of them. Note that this single
link between the 2 PEs could also be replaced by a layer-2 switched network if direct physical
connection between the PEs is not possible. The only requirement for the connections is that the 2
PEs have to be “directly connected” at layer 3.
Both the customer RED and customer GREEN networks (or VPN) consist of internal routes with
overlapping IP address ranges. Thus, traffic communication within each customers’ VPN across the
2 PE routers, i.e. between CE1 and CE4, and between CE2 and CE3, must be separated using
VRFs.
The following sections provide two examples of how to set-up the network shown in Figure 26 using
different routing protocol configurations:
• Configuration 1 – eBGP Configured between PE1 and PE2 with OSPF (Area 0) Configured
between PEs and CEs
• Configuration 2 – OSPF (Area 0) Configured between PE1 and PE2 with OSPF (Area 1 and Area
2) Configured between PEs and CEs