routing protocol

[raajeshkumar]

in my backbone network i am using ospf and isis routing protocols. In my network i am having the routres that support both ip and isis. i am using both cisco and juniper routers. in one place i want to convert the isis packets to ip packets and i want to transfer the isis packets through ip backbone. guys pls give me some solution.

[devang_etcom]

i think you can find your solution using REDISTRIBUTION...

[mheusinger]

Hi,

ISIS will not be using IP for transporting routing updates. The only two solutions I know of are:

1) build a GRE tunnel between two ISIS routers and transport ISIS through GRE

2) redistribute ISIS into another routing protocoll, f.e. OSPF or BGP, whatever seems more suitable.

Option 1) might have some MTU issues, but you have ISIS continuity, no external routes etc.

Option 2) might have some routing loop issues and does not preserve route type, i.e. you will always get external routes.

So there are pros and cons to each option. You need to decide, wich one is more favourable.

Hope this helps! Please rate all posts.

Regards, Martin

[raajeshkumar]

Dear Martin

Thanks for your resonse. Our network is MPLS network . we are using this OSI routers(ISIS) to communicate with some nortal equipments.from nortel equipment then its goes to one ISIS router and then one more ISIS router. After that i want to transfer this packets through IP based routers. In this case redistribution will work. let me know redistribution be configure in OSI router or IP router.

[mheusinger]

Hi,

do I understand you correctly, that you need CLNS connectivity across an MPLS backbone? Or is it IP connectivity? Could you please post some more info, why you need ISIS in the network? It would help to find the most suitable solution.

Well in the latter case you should identify one or two routers in your topology, where you have both, OSPF and ISIS and do the redistribution.

If you take two routers for redundancy you might easily get routing loops, so tight filters are required during mutual redistribution.

Thinking about it, there are two more possible options you have:

3) implement Ethernet over MPLS and run ISIS across the ethernet link.

4) if you do not need CLNS, but only IP connectivity (which I can not tell from your posts so far) you could also remove ISIS completely from your network.

Hope this helps! Please rate all posts.

Regards, Martin

[raajeshkumar]

Hi

By seeing your reponse i got some idea. i attached the simple diagram also here.

[mheusinger]

Hi,

what is unclear to me is: does the NOC need IP connectivity or do they need CLNS/CLNP to the Nortel?

If it is IP your suggested network diagram should work.

Hope this helps! Please rate all posts.

Regards, Martin

[raajeshkumar]

The Nortel equipment is attached with some other telecom network. If the Nortel equipment goes down means the NOC want to know. for that only the data network ip or isis. The visibility of the Nortel equipment is via first, using with CLNS and then after the redistribution it is in IP network.NOC can only listen the ip packets.