MPLS TE Tunnel

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After having established the TE tunnel, the next step in deploying MPLS-TE is to direct traffic down the TE tunnel. Directing traffic down a TE tunnel can be done by one of the following four methods:

  • Autoroute—The TE tunnel is treated as a directly connected link to the tail IGP adjacency and is not run over the tunnel. Unlike an ATM/FR VC, autoroute is limited to single area/level only.
  • Forwarding adjacency—With autoroute, the LSP is not advertised into the IGP, and this is the correct behavior if you are adding TE to an IP network. However, it might not be appropriate if you are migrating from ATM/FR to TE. Sometimes advertising the LSP into the IGP as a link is necessary to preserve the routing outside the ATM/FR cloud.
  • Static routes
  • Policy routing

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