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Routing & Switching · Advanced

PE-CE Routing

The routing protocol between a provider PE (in a VRF) and a customer CE: static, eBGP, OSPF, EIGRP, IS-IS or RIP.

Definition

eBGP is most common because it preserves policy and scales. OSPF as PE-CE uses domain IDs, the down bit and sham links to preserve route types and avoid loops. EIGRP PE-CE uses BGP cost community and SoO.

Example

address-family ipv4 vrf CUST / neighbor 192.0.2.2 remote-as 65010

Exam tip

OSPF PE-CE routes appear as inter-area (O IA) at remote sites when domain IDs match.

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