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Data Center High Availability Clusters Design Guide
OL-12518-01
Chapter 4 FCIP over IP/MPLS Core
MPLS VPN Core
Figure 4-9 MPLS VPN for Storage Architecture
Multiple storage customers can be supported on the same MPLS network. Customer 1 cannot see the
customer 2 network because there are separate VPN routing/forwarding (VRF) tables for each customer.
Using VRF VPNs
A VRF VPN tunnel is built to provide a secure, managed network between the storage devices. In
addition, MPLS VRF VPNs provide distinct advantages for transporting multicast FCIP. VRF VPNs also
provide scalability, performance, and stability of the system.
MPLS VPNs use Multiprotocol Border Gateway Protocol MP-BGP) between the provider edge (PE)
routers to facilitate the routes between storage VPN areas. MPLS forwarding is used to carry the packets
across the backbone. PE routers can use multiple routing and forwarding instances. BGP propagates
reachability information for VPN-IPv4 prefixes among PE routers using MP-BGP. This ensures that the
routes for a given VPN are learned only by other members of that VPN, enabling members of the VPN
to communicate with each other.
When a VPN route learned from a customer edge (CE) router is injected into BGP, a list of VPN
route-target extended-community attributes is associated with it. Typically, the list of route-target
community values is set from an export list of route targets associated with the VRF from which the route
was learned. Based on the routing information stored in the VRF IP routing table and the VRF Cisco
Express Forwarding (CEF) table, packets are forwarded to their destination using MPLS. A PE router
binds a label to each customer prefix learned from a CE router and includes the label in the network
reachability information for the prefix that it advertises to other PE routers.
VRF SAN
spse 7606-60
GSR12410
spse 7609-46
VRF SAN
GE
GE
GE
GE
132426
SAN 9216
1 14+2
SAN 9216
1 14+2
1/1
2/1
2/3
1/2
2/4
1/1
2/1
VRF SAN
spse 7609-45
GSR12410
spse 12408-51
VRF SAN
SAN 9216
1 14+2
SAN 9216
1 14+2
1/2
2/2
2/4
2/3
2/2
1/1
GE
GE
GE
2/4
1/2
2/2
2/1
2/3
2/1