WAN Redunancy

[p-allen]

We have a site that is a 100mb fiber connection back to our main site. We are looking at getting a backup ds3 circuit. I need to know what options we would have to make this happen...ie...hsrp?? etc

the 100mb circuit comes back to our main site to our 6509. The other one I would assume would come back to a 3845 or 2600 router. I have looked into a couple options but am now confused as to which one would work. let me know if you need more info.

[Collin Clark]

A 3825 supports sub-rate DS3 and 3845 supports full rate. Use your routing protocol to control traffic. HSRP is for gateway redundancy (ie your clients gateway's).

HTH and please rate.

[p-allen]

not sure what you are suggesting? What about if we use one 2801 at our remote site and at the main site we use a route metric to determine if the eigrp route is down then use the static route assigned a larger distance?

[Collin Clark]

Router models-Certain models support certain rates.

Cisco T3/E3 Network Module Data Sheet

http://cisco.com/en/US/products/hw/modules/ps2797/products_data_sheet09186a008010fba2.html

DS3/E3 ATM Network Modules for the Cisco 2600/3600/3700 Series

http://cisco.com/en/US/products/hw/routers/ps274/products_data_sheet09186a0080091b9e.html

Again, let your routing protocl control which link is used (or both).

[fcltd-thai.tran]

I'm not sure how the information of a 3825 being only a subrate DS-3 and 3825 supporting Full rate came about.

From what I see:

3825 - 350,000pps x 512 (64bytes) = 179.2Mbps

3845 - 500,000pps x 512 (64bytes) = 256Mbps

If you have information or experience that shows otherwise, please explain so we may learn from it.

Thanks...

[Collin Clark]

Talk to Cisco, it's directly from their datasheet (see previous post links).

[fcltd-thai.tran]

I'll give that a try. I just found conflicting information here.

http://www.cisco.com/warp/public/765/tools/quickreference/routerperformance.pdf

Thanks...

[fcltd-thai.tran]

Based off the link you provided:

http://cisco.com/en/US/products/hw/modules/ps2797/products_data_sheet09186a008010fba2.html

Table 1.

Cisco 3825 - Full rate T3/E3 with no services

[royalblues]

3825 router supports only 1 DS3 card and that card could only run at full rate if there are no services configured.

Example of services are QoS, NBAR, IPSec, FW, IDS, NAT and NeFlow.

HTH, rate if it does

Narayan

[amit-singh]

What Clark is trying to suggest it to use a routing protocol like EIGRP between the two sites and have all your routes advertised via EIGRP across all routers.

What would be you final connectivity for your network. Could you please paste a rough network diagram ?

If you are using two routers in HSRP one will be a primary and the other will be a standby. only the primary router fowards the traffic not the standby one. If you are using EIGRP, it will have 2 different active routes between the sites and you can achieve EIGRP equal/unequal cost load-balancing.

Let us know the finally topology and lets take after on.

HTH,

-amit singh

[p-allen]

Here is a rough draft we advertise eigrp for the 100MB links. right now we can only do static routes for the ds3 links. we might be able to due bgp as the circuit provider changes things. So in this diagram I would have to routes to the remote location. We would like the smaller pipe to be used when the primary fails. What is the best way to do this? I was thinking of changing the metric for the slower pipe. Is there a better way to do this? Let me know if you need to see current configs or more detail. thanks for your help.

[royalblues]

In that case just increase the AD of the static routes to anything greater than 90.

This will ensure that the slower pipe gets kicked in only when your EIGRP fails

HTH, rate if it does

Narayan

[p-allen]

like what is mentioned in this article...correct?

http://www.cisco.com/warp/public/105/admin_distance.html

[royalblues · Accepted solution]

Exactly.

These static routes are called as floating static routes

http://www.cisco.com/warp/public/125/fr_isdn_backup.html

HTH

Narayan

[adnan.zafar]

Hi

as far as i got HSRP will work for your enviroment because you want your DS3 come alive whenever you 100mb fiber goes fails.

If i m wrong then please do let me know