Configuring Vrfs - Cisco WS-CBS3032-DEL Software Configuration Manual

Chapter 39 Configuring IP Unicast Routing
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Configuring VRFs

Beginning in privileged EXEC mode, follow these steps to configure one or more VRFs. For complete
syntax and usage information for the commands, see the switch command reference for this release and
the Cisco IOS Switching Services Command Reference, Release 12.2.
Command
Step 1
configure terminal
Step 2 ip routing
Step 3 ip vrf vrf-name
Step 4 rd route-distinguisher
Step 5 route-target {export | import | both}
route-target-ext-community
OL-13270-06
The PE router does not recognize a difference between using multi-VRF CE or using multiple CEs.
In Figure 39-6, multiple virtual Layer 3 interfaces are connected to the multi-VRF CE device.
The switch supports VRF over physical ports, VLAN SVIs, or a combination of both. The SVIs can
be connected through an access port or a trunk port.
A customer can use multiple VLANs if they do not overlap with those of other customers. A
customer's VLANs are mapped to a specific routing table ID that identifies the appropriate routing
tables stored on the switch.
A switch supports 1 global network and up to 26 VRFs.
Most routing protocols (BGP, OSPF, RIP, and static routing) can be used between the CE and the
PE. However, we recommend using external BGP (EBGP) for these reasons:
BGP does not require multiple algorithms to communicate with multiple CEs.
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BGP is designed for passing routing information between systems run by different
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administrations.
BGP simplifies the passing of attributes of the routes to the CE.
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Multi-VRF CE does not affect the packet switching rate.
VPN multicast is not supported.
You can configure 104 policies whether or not VRFs are configured on the switch or the switch
stack.
You can enable VRF on a private VLAN and the reverse.
You cannot enable VRF when policy-based routing (PBR) is enabled on an interface and the reverse.
You cannot enable VRF when Web Cache Communication Protocol (WCCP) is enabled on an
interface and the reverse.
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
Purpose
Enter global configuration mode.
Enable IP routing.
Name the VRF, and enter VRF configuration mode.
Create a VRF table by specifying a route distinguisher.
Enter either an autonomous-system number and an
arbitrary number (nnn:y) or an IP address and arbitrary
number (A.B.C.D:y)
Create a list of import, export, or import and export
route-target communities for the specified VRF. Enter
either an autonomous-system number and an arbitrary
number (nnn:y) or an IP address and an arbitrary number
(A.B.C.D:y). The route-target-ext-community should be
the same as the route-distinguisher entered in Step 4.
Configuring Multi-VRF CE
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