OSPF as PE-CE routing protocol in Mpls

  1. What feature we can use to prevent routing loop for dual home CE?
    1. PE set “down bit” for LSA type 3 and reject LSA type 3 from CE with “down bit” set
  2. What feature we can use to keep external route as LSA type 5 or type 7 for network with dual OSPF processes when using MPLS L3VPN as inter-site connection?
    1. Configure domain-ID on PE. PE with same domain-ID advertises LSA 1/2/3 as LSA3 to CE. PE with difference domain-ID advertises all LSA as LSA type 5
  3. What feature we can use to prefer MPLS Backbone link over intra area backdoor link?
    1. Run “OSPF Sham-link” between PEs.
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