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roz
New Member

Ospf Fast Convergence,

Good afternoon,

My name is Rahmi Oz. I am a Network Eng for a small Telco in Charlotte, NC. My question is about OSPF Fast Convergence. Our core network is MPLS and we are only using MPLS for Fast Re-Route we are not doing any Traffic Engineering. I would like to impellent OSPF Fast Convergence features instead of using MPLS FRR in the Core.

1- Is OSPF Fast Convergence really faster than MPLS FRR?

2- What are the pros and cons of adapting OSPF Fast Convergence over MPLS FRR?

3- As far as the configuring OSPF Fast Convergence goes, Can you please review the configuration below and let me know if I am missing any thing?

interface GigabitEthernet x/y

ip ospf dead-interval minimal hello-multiplier 5

!

router ospf 10

ispf

timers throttle spf 50 50 5000

timers throttle lsa all 0 20 5000

timers lsa arrival 15

timers pacing flood 15

Thank you very much for your time and for your help.

Rahmi Oz

4 REPLIES

Re: Ospf Fast Convergence,

Hi Rashmi,

If I were you, I would have definitly opted for the MPLS FRR, as things are faster at L-2 than at the L-3 (I assume), however there is a certain cost to it.

Please visit the link for more info on MPLS FRR

http://cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a0080264560.html#wp1357510

and following link for more info on OSFP Fast Convergence

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s23/fasthelo.htm

Now, depending upon your underlying Hardware you may safely take the MPLS FRR or otherwise the OSPF Fast Convergence.

Hope this helps.

Regards,

Wilson Samuel

roz
New Member

Re: Ospf Fast Convergence,

Hi there Wilson,

Thank you very much for your response. We use Cisco 7609 Routers to do MPLS FRR, I however wanted to discover other options, such as OSPF Fast Convergence.

I am still debating though.

Thanks again,

Rahmi

Re: Ospf Fast Convergence,

hi....

have you seen this link:http://www.cisco.com/en/US/tech/tk365/technologies_white_paper0900aecd80244005.shtml

but for this you need specific hardware... if your network infrastructure fullfil the requirement for BFD then this will be good...

regards

Devang

roz
New Member

Re: Ospf Fast Convergence,

Devang,

Yes I did. That is the feauture actually enabled for 12000 GSRs and up. Like everything else, Cisco develops all the good stuff for the higher end routers.

We have 7609 Routers, I dont think it can do BFD.

Thanks for the information though.

Rahmi

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