Configuring Multi-Vrf Ce; Understanding Multi-Vrf Ce - Cisco 3845 - Security Bundle Router Software Manual
Software configuration guide
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Configuring Multi-VRF CE
Command
Step 7
show bfd neighbors detail
Step 8
copy running-config startup-config
To disable reenable echo mode on the switch, enter the bfd echo global configuration command.
Configuring Multi-VRF CE
Virtual Private Networks (VPNs) provide a secure way for customers to share bandwidth over an ISP
backbone network. A VPN is a collection of sites sharing a common routing table. A customer site is
connected to the service-provider network by one or more interfaces, and the service provider associates
each interface with a VPN routing table, called a VPN routing/forwarding (VRF) table.
The switch supports multiple VPN routing/forwarding (multi-VRF) instances in customer edge (CE)
devices (multi-VRF CE). With Multi-VRF CE, a service provider can support two or more VPNs with
overlapping IP addresses.
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Understanding Multi-VRF CE
Multi-VRF CE allows a service provider to support two or more VPNs, where IP addresses can be
overlapped among the VPNs. Multi-VRF CE uses input interfaces to distinguish routes for different
VPNs and forms virtual packet-forwarding tables by associating one or more Layer 3 interfaces with
each VRF. Interfaces in a VRF can be either physical, such as Ethernet ports, or logical, such as VLAN
SVIs, but an interface cannot belong to more than one VRF at any time.
Multi-VRF CE interfaces must be Layer 3 interfaces.
Note
Multi-VRF CE includes these devices:
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Cisco ME 3800X and 3600X Switch Software Configuration Guide
29-80
Purpose
Verify your entries.
(Optional) Save your entries in the configuration file.
Understanding Multi-VRF CE, page 29-80
Default Multi-VRF CE Configuration, page 29-82
Multi-VRF CE Configuration Guidelines, page 29-82
Configuring VRFs, page 29-83
Configuring VRF-Aware Services, page 29-84
Configuring a VPN Routing Session, page 29-87
Configuring BGP PE to CE Routing Sessions, page 29-88
Multi-VRF CE Configuration Example, page 29-88
Displaying Multi-VRF CE Status, page 29-92
Customer edge (CE) devices provide customers access to the service-provider network over a data
link to one or more provider edge routers. The CE device advertises the site local routes to the router
and learns the remote VPN routes from it. The Cisco ME 3400 switch can be a CE.
Provider edge (PE) routers exchange routing information with CE devices by using static routing or
a routing protocol such as BGP, RIPv2, OSPF, or EIGRP. The PE is only required to maintain VPN
routes for those VPNs to which it is directly attached, eliminating the need for the PE to maintain
Chapter 29
Configuring IP Unicast Routing
OL-23400-01
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