Nov 29 2008
Traffic Engineering – IGP extensions (OSPF)
OSPF has been extended using TLV and sub-TLVs in order to be used with Traffic Engineering.
RFC 3630 contains details of the extensions.
The OSPF TLV extension for TE is also referred to as OSPF Opaque LSA 10. This LSA has an area flooding scope.
Opaque LSA 10 contains 2 top level TLVs.
1. Router Address TLV
2. Link TLV
Router Address TLV
If a router advertises BGP routes with the BGP next hop attribute set to the BGP router ID, then the OSPF router ID should be the same as the BGP router ID.
Link TLV
The Link TLV describes a single link. It is composed of a set of sub-TLVs. The key sub-TLVs are:-
Sub-TLV 6 – Maximum bandwidth (4 octets)
Sub-TLV 7 – Maximum reservable bandwidth (4 octets)
Sub-TLV 8 – Unreserved bandwidth (32 octets)
