RE: : MPLS Convergence Upon Fiber Link Down

MPLS does not increase convergence by default.  Also neither does using BFD.

Robert McCallum 
Senior Consultant

> -----Original Message-----
> From: Peter Macaulay [mailto:peter.macaulay <at> ZDSL.com]
> Sent: 19 March 2007 04:22
> To: mpls-ops <at> mplsrc.com
> Subject: [MPLS-OPS]: MPLS Convergence Upon Fiber Link Down
> 
> I have a network now of 12 nodes with OSPF and BFD (Bidirectional
> Forwarding Detection) with 100 ms timers.  No reply to three BDF
> packets is defined as dead. Each node has 4 GigE fibers. On this
> size network we get convergence in about 1000 ms.
> 
> Our network is about to double to 24 nodes, again with 4 GigE
> fibers.
> 
> I'm thinking the BDF "keep alives" will start to get in the way
> of our user traffic. At what point does a switch to MPLS make sense
> if we want to maintain < 1 second fiber out or node failure convergence?
> Now? Or >20 nodes?  Any help with the math (arithmetic?) would be
> great. Thank you.
> 
> /PETER MACAULAY
>   ZDSL.COM
> 
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