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New Member

7 Equal cost paths in ospf

Hi.we are using ospf and have 6 equal cost paths between two sites.Now we are coming up with 7th IPLC,now how to support this 7th IPLC.

i cannot use multilink caz if one link of a mullink bundle fails i have to take full multilink out of production.

I cannot use two routers as if one router has 4 E1`s and other has 3 E1`s and 3 out of 4 E1`s fail on a router then only one E1 will have to bear the 50% load,

Can anyone suggest a good solution for my problem

regards

dinesh

7 REPLIES

Re: 7 Equal cost paths in ospf

Dinesh,

Your question didnt come through...

Re: 7 Equal cost paths in ospf

Why not group them into multilink bundles of group 2,2 and 3, so that even if one of the links of any bundle goes down, you still have 2 remaining groups available. Now for OSPF, there will be only 3 routes available for equal cost load balancing.

New Member

Re: 7 Equal cost paths in ospf

Hi shanky.

well we are using IPLC`s and we are paying for each IPLC.Now suppose we have bundled 2 IPLC`s into one multilink bundle,if only 1 of these 2 is down or fluctuating we have to take whole multilink bundle out of production.we r running OSPF and VOIP,so cannot bear any fluctuations.Moreover the bundle that will have 3 E1`s if in that one E1 fails we will loose other two also.

so it is not feasible in our network.

hope i m clear.

plz suggest

regards

dinesh

New Member

Re: 7 Equal cost paths in ospf

Hi dinesh

one clarification needed why do you have to take the whole multilink bundle out of production when one E1 fails?

what i would suggest is that there is very high probabbility of the E1 increasing in future so go in for a HSSI, connect all E1 to a black box ( for eg Nortel passport) and give the multiplexed o/p to the HSSI.

rgds

New Member

Re: 7 Equal cost paths in ospf

I may be way off here, but if a link goes down , wouldn't the new link state DB reassess equal paths with only the usable links?

Bruce Davis, CCNA since 2003

Gold

Re: 7 Equal cost paths in ospf

Late code can support up to 8 parallel links, using cef for load sharing, if this is any help.

Russ

New Member

Re: 7 Equal cost paths in ospf

Hi.

well if one E1 of the Multilink Bundle is fluctuating,then it will effect the whole Multilink bundle,as our is a VOIP network we cannot allow fluctuations as it causes voice issues.

Russ please tell me how can i support 8 links on load balancing using cef.

regads

Dinesh

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