OSPF Redunant Routers Quesiton

[bberryca]

Hello All,

Any help i can get on this would be appreciated.

So i have 6 sites with 6 10mb point to point links in a ring topology. Each point to point link has two ports provided by the telco. at each site I have 2 2950's and 2 1841's.

every site is laid out the same, each site has two point to point links attaching it to two other sites.

so.. port 1 from the telco (going to the first point to point link) goes to port one on the first 2950. Port 2 (going to the first point to point link) from the telco goes to port one on the second 2950.Port 3 from the telco (going to the second point to point link) goes to the second port on the first 2950. and then port 4 from the telco (going to the second point to point link)gores to the second port on the second 2950.

i then have port 24 on the first 2950 going to the first 1841 on port f0/0 trunked with two vlans.and port 24 on the second 2950 going to the second 1841 on port f0/0.(using sub interfaces)

ports f0/1 on both 1841's go to the local lan and have hsrp runing.


each link has its own /28 subnet.

Note: from site A first 1841 port f0/0 i can ping the interface (f0/0) of both 1841's at site b but i cannnot ping the second 1841 at site A on port f0/0. (this is something the telco has setup) so i cannot run hsrp on the f0/0 side, unless i put i crossover between the two 2950's(pros/cons?)

I have the first 1841 at each site currently functioning in a ospf ring, i have costed out one on the links to prevent duplicate routes.

issue is i am not sure how to go about adding the second 1841 at each site, i want it to auto fail over to the secondary router if the first one fails. i've tried costing every router over but im not sure if that is the way to go. thinking maybe priority? but im really not sure how to go about this.

thanks for you help if you need more info please let me know.

Regards,
Brad

 

[unclerico]

can you put together a diagram and post it??

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[bberryca]

Hello,

I have uploaded a pdf of my layout, any help you can provided would be appreciated.

Thanks,
Brad

 

[unclerico]

so your goal is obviously redundancy and not load sharing, correct??

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
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[bberryca]

Correct,fully redundant, dual 1841's dual 2950's dual lan connections, and eventually dual telco gear connecting to separate pop's.(but thats down the road and will not effect my configuration)

 

[unclerico]

I would choose one router to act as your primary for each site (obviously you already have with hsrp). On the secondary 1841 in each site, configure higher ospf costs for both the f0/0 and f0/1 interfaces so that all traffic will route through the primary 1841. Configure HSRP to track both f0/0 and f0/1 on each 1841.

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)