Genie's Tech Blog

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MPLS TE: Auto-Tunnel Mesh Groups

Hello Friends Today, I am going to discuss about one of the interesting features on MPLS TE which is the Auto-Tunnel feature which gives us the capability to create TE tunnels automatically based on the destination list. The Auto-Tunnel feature provides automatic creation of one-hop primary TE tunnels (Auto-Tunnel Primary), and both nhop and nnhop FRR backup TE tunnels (Auto-Tunnel Backup).  Auto-Tunnel Primary and Backup can be enabled separately via CLI configuration. The Auto-Tunnel Primary feature, once enabled, causes the router to dynamically create one-hop tunnels to directly... [More]

Inter-Area MPLS TE on IOS-XR

Hello Everyone, As mentioned earlier, today I will be discussing about Inter-Area MPLS TE. In my previous blog, we already discussed regarding Inter-Domain MPLS traffic engineering and we further discussed on the Inter-AS MPLS traffic engineering. We are now going to the second form of Inter-Domain MPLS traffic engineering i.e. Inter-Area MPLS traffic engineering. Inter-Area MPLS TE is fairly simple as compared to Inter-AS MPLS TE. Also, I will be discussing this topic on IOS-XR platform. The MPLS TE Interarea Tunnels feature allows you to establish MPLS TE tunnels that span multiple Interio... [More]

Inter-AS MPLS TE

Hello Everyone, Today I am going to discuss about Inter-AS MPLS Traffic-engineering (TE). Till now we have seen how MPLS behaves within a single AS but will not see the functionality and implementation of Traffic-engineering Tunels. Actually Inter-AS MPLS TE is a part of Inter-Domain Traffic-engineering in which a domain is identified as an IGP area or an Autonomous-System. In Inter-Domain TE, Head-End router lacks complete network topology to perform path computation in both cases.  Inter-Domain TE Fast-Reroute: The Inter-Domain TE FRR has the same configuration as the single doma... [More]

Loop Free Alternate Fast-Reroute - IP LFA FRR

Hello Friends,  I am back with yet another discussion on a very interesting topic - IP LFA FRR. But before we discuss about this, lets first discuss the what was the need for such development. Problem: A change in network topology upon a failure triggers network wide convergence. For example, when a local link fails, a router currently must signal the event to its neighbors via the IGP, re-compute new primary next-hops for all affected prefixes, and then install those new primary next-hops into the forwarding plane. Until the new primary next-hops are installed, traffic directed toward... [More]

MPLS TE with Fast-Reroute (FRR) - Link Protection

Hey Guys, Today I have a very interesting topic to discuss. We are going to discuss about MPLS Traffic-engineering (TE) with Fast-Reroute (FRR). Actually, I came across some customer issue and I had to dig deeper into the platform level of 7600 to find out the root cause. But, then lately I realized that I should share the concept with everyone. So here it is..  MPLS Traffic-Engineering MPLS TE combines the ATM's Traffic engineering capabilities with IP's flexibility and Class-of-Service differentiation. MPLS TE tunnels are unidirectional tunnels which are build on the LSP's across you... [More]