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Contributor
aeroplane
Posts: 724
Registered: ‎06-30-2009
0
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Why CSPF is required for Fast Failover (FRR, Link/Node Protection)??

Hi Experts

 

Whey CSPF (Traffic Engineering Database) is required for MPLS Fast Failover in MPLS? Because as I believe it is required for MPLS traffic engineering (that is link colouring, bandwidth reservation etc).

 

Thanks for the reply

Visitor
emusamu
Posts: 2
Registered: ‎01-10-2012

Re: Why CSPF is required for Fast Failover (FRR, Link/Node Protection)??

Hi Aeroplane,

 

The detour bypass lsp that is to be used in case of link failure should be adequate to accommodate all TE specs needed by the protected lsp.

 

BR

Trusted Expert
Kashif-rana
Posts: 417
Registered: ‎01-29-2008

Re: Why CSPF is required for Fast Failover (FRR, Link/Node Protection)??

Hi

 

The detour (fast reroute) inherits the link colouring from the protected LSP although bypass LSP (link/node protection) does not. But you can manually specify the link colouring/bandwidth for the detour and bypass LSP. Since link colouring and bandwidth reversation etc requires the CSPF thats why FRR, Link/Node protection needs the CSPF.

 

HTH

Kashif Rana
JNCIE-SEC, JNCIE-ENT, JNCIE-SP, JNCIS(FWV,SSL),JNCIA(IDP,AC,WX),BIG IP-F5-LTM, CCNP
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Contributor
aeroplane
Posts: 724
Registered: ‎06-30-2009
0

Re: Why CSPF is required for Fast Failover (FRR, Link/Node Protection)??

Thanks for both. How we can specify the contrainsts for detours?

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