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Bury the hatchet

Carrier Supporting Carrier – The whole story (1)

After I’ve completely illustrated the Inter-AS MPLS VPN solution with all its options, I’ve decided to cover the Carrier Supporting Carrier with all its options as well. It was described as Carriers’ Carriers in draft-ietf-2547bis section 9 and followed in the final RFC 4364, and was named Carrier Supporting Carrier by Cisco, and Carrier of Carriers by Juniper. Carrier Supporting Carrier solution enables small service providers to use the cloud of another large service provider in order to connect parts of their own networks, using the transport services provided by another service provider in this manner eliminates the need for …

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Inter-AS MPLS VPN – The whole story – Updated Dec 2008

While doing the final preparations for my CCIE SP track written exam, I reviewed my Inter-AS MPLS VPN posts and I found out that they needed some modifications to be more organized and comprehensive, please revisit the updated posts: Inter-AS MPLS VPN – The whole story (1) Option 1(10A): Back-to-Back VRF – Inter-AS MPLS VPN – The whole story (2) Option 2 (10B): ASBR-to-ASBR / MP-eBGP for VPNv4 – Inter-AS MPLS VPN – The whole story (3) Option 3 (10C): Multi-Hop MP-eBGP Between RR and eBGP Between ASBRs – Inter-AS MPLS VPN – The whole story (4) Option AB – …

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BGP performance tuning – Convergence, Stability, Scalability and NSF (Part 1)

It is a very critical matter for a network architect (the same goes for a network operator but with a different prospective) to understand the inside out of tuning the routing protocols performance, in order to be able to conduct an appealing and effective low level design for small to large scale networks. We have been discussing IGPs performance tuning in other posts, in this thread I’ll try to illustrate a simple description for all the tools/parameters affecting BGP performance (convergence, stability, scalability, and non-stop forwarding), with the defaults values and the recommended values for each.

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Cisco and Nonstop Forwarding

Nonstop Forwarding is a feature of many features in the Cisco High Availability portfolio, we shall be covering most of it later. To check Cisco High Availability portfolio: http://www.cisco.com/en/US/products/ps6550/products_ios_technology_home.html Use Cisco Feature Navigator to find information about platform support and software image support: http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp Cisco Nonstop Forwarding (NSF – AKA Graceful Restart) with Stateful Switchover (SSO – SSO is a prerequisite for NSF) is a Cisco innovation for platforms with dual route processors (Cisco 7304, 7500, ASR1000, 4500, 6500, 7600, 10000, 12000 and CRS), allowing a NSF Capable router which has experienced a hardware or software failure of an active …

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Option AB – Inter-AS MPLS VPN – The whole story (5) – Updated Dec 2008

In late 2007, Cisco introduced a new Inter-AS option; Option AB – This feature was introduced in the 12.2(33)SRC code. This feature combines the the best aspects of Option 1 (10A) and Option 2 (10B) (named type a and type b as per RFC4364 section 10 “Multi-AS Backbone”). Remember that type a (Option 1 AKA 10A) was not scalable, since a separate interface/subinterface and an eBGP session are required per each VRF on the ASBR, while it is simple, secure and per VRF QoS capable (per VRF interface/subinterface). On the other hand type b (Option 2 AKA 10B) despite being …

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