Asr 5X00 As A Pe; Overview; Sample Configuration - Cisco ASR 5000 Administration Manual

Staros release 21.1

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BGP MPLS VPNs

ASR 5x00 as a PE

In this scenario, the ASR 5x00 functions as a PE router sitting at the edge of the MPLS core. See the figure

Figure 20: ASR 5x00 as a PE

The ASR 5x00 eliminates the need for an ASBR or PE as shown in the first two scenarios. In this scenario,

two main requirements are introduced: IBGP functionality and MPLS label distribution protocols.

The ASR 5x00 can be configured to add two labels:

• an outer label learned from LDP or RSVP-TE (RSVP-Traffic Engineering)

• an inner label learned from MP-iBGP

This solution supports traffic engineering and QoS initiated via the ASR 5x00.

In this example, VRFs are configured on the ASR 5x00 PE and pools are associated with VRFs. The ASR

5x00 exchanges VPN routes with its IBGP peers (PE routers) and learns the MPLS paths to reach PEs via

ASR 5000 System Administration Guide, StarOS Release 21.1

ASR 5x00 as a PE