OSPF

Redistributing ISIS into OSPF

8 January, 2009 Posted by Zarar As CCIE SP, IS-IS, OSPF, iPod (0) Comment

Someone asked me recently for an example of ISIS redistribution into OSPF. So here goes.
Consider the toplogy below.

We redistribute ISIS into OSPF and vice versa on R2. We should then be able to ping R1 loopback from R3 loopback and vice versa.
Watch the video below or alternativly click here to download and watch [...]

Categories : CCIE SP, IS-IS, OSPF, iPod

Traffic Engineering – IGP extensions (OSPF)

29 November, 2008 Posted by zismail As CCIE SP, OSPF, Traffic Engineering (0) Comment

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 [...]

Categories : CCIE SP, OSPF, Traffic Engineering

OSPF Sham-Links

18 November, 2008 Posted by zismail As CCIE SP, MPLS VPN, OSPF, PE-CE Routing (0) Comment

OSPF sham-links give the technical administrator an option to use either the back door link or the WAN link by presenting Type 1 LSAs over the WAN cloud. CEs then have Type 1 LSAs via 2 routes and as they are the same type of LSA you can manipulate the cost to either use the [...]

Categories : CCIE SP, MPLS VPN, OSPF, PE-CE Routing