Cisco Routers Question about IGRP
Squill
Chesterfield, Va
Okay we're setting up a lab in class, we have 5 routers set up and we just set up IGRP, the 2 different AS's are 100 and 200. I'm in the 200 AS. My teacher told us to figure out a way to ping the routers in the 100 AS. Because when I try a normal ping it doesnt work. Pretty much teh question is "What needs to be done in order to ping the other AS" I already tired asking the teacher if I could just change the AS of my router or change the router protocol to RIP. She said we cannot do that, and there is an answer, I just cant find it anywhere on google. Just wondering if any of yall know the answer.
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Soooo.. I <b>think</b> you configure BGP like this:
Step 1:
Router(config)# router bgp AS#
Enables a BGP routing process, which places the router in router configuration mode.
Step 2:
Router(config-router)# network network-number [mask network-mask] [route-map route-map-name]
Flags a network as local to this autonomous system and enters it to the BGP table.
Step 3:
Router(config-router)# neighbor {ip-address | peer-group-name} remote-as as-number
Specifies a BGP neighbor.
That SHOULD enabled BGP with your AS as the local, and the one you want to communicate with as the remote. Should bridge the 2 ASes. It's been a long time since I've done Cisco CLI.. So, YMMV.
Two routers for each AS, then fifth used to bridge, ideally. Ask your teacher what to study to set up a Cross-AS bridge, or if she can show you an example of just the bridge.
You have an idea that is right, and this is a hint.... In cisco you can run more than one protocol on a router. Can RIP bridge??? Yes. Can a port or group of ports be told to work as a bridge using RIP while the other ports are used for IGRP??? On some Cisco routers, YES. do you have to tell the router to bridge using some ports and use others for WITHIN -THE-AS connection routing??? Typically, that depends on how old the routers are.
This is port specific protocol assingment exercise or a mixed mode by router adn specifc port exercise. You set up teh router to bridge as multiprotocol router or you tell the routers you want to bridge by port to use different protocols and run both on both ends of the bridge and not just one or the other. Your two AS groups get to cooperate to do this, as to the IP and masks used. I think your teacher thought you were asking something with an either-or choice and this is a BOTH choice for what router CAN use with each running only on parts problem. Simplest answer is to set up a logical bridge that uses a router as a bridge, or to set up multiprotocol routers.
Some of the newest Ciscos can do parts of this automatically. Routers can act as switches logically also, and port groups or single ports as bridges while others work within a same protocol WAN structure. in essence you need a port conversion over bridge and then a conversion back for AS group at each end. This can be router to router (harder) or can be using a router to communicate across ports. Run the idea of router as bridge by your teacher. And see if he or she is willing to show an example of just the bridge part.
Some routers from Cisco now use BOTH protocols running and figure out which to use almost automatically, some were dumb enough that you had to tell them. If you use the dumber ones to learn the rules, then you know most of what the newest ones do automatically. Also ask the teacher for the router manuals, they will give you ideas as to how each works, and see if she or he has an IOS programming manual in her reference or can give you an idea on how to access same within your acadamy's reference framework.
Start with how to get info, then ask questions that answer PARTS of problem. going back to only what you know will not solve exercise, but using BOTH can be done. Ask her also if she will let you use a switch to bridge between the two routers. Academy grads are sworn not to give whole answers out, in fact you are supposed to eb able to get things working from someone else's startign point as many times advanced techs have to figure out what someone else did wrong and fix in minimum time with as much of the existing hardware used as possible-- no new hardware, minimal changes that require lots of fixing. So use ports not now used for bridging.
That is all I can fairly say as an academy grad until you get more specific with questions about what ideas you do not understand. AS is used differnet to create the need for a bridge and make things within each AS more secure from unwanted accesses.
We had 8 routers set up. 4- 2500's and 4- 2600's. The 2500's were on the 10 AS and the 2600's were on teh 20 AS. Me and a few class mates figured this out today. Heres alittle diagram at the bottom to help
AS 10
(1)-(2)-(3)-(4)
| asdfasdfas|
(5)-(6)-(7)-(8)
AS 20
We set up routers 4 and 8 on both of the AS's. So the configuration looked something like this.
Router(config)# router igrp 10
Router(config-router)# network (ipaddy)
Router(config-router)# network (ipaddy)
Router(config-router)# ctrl-z
Router(config)# router igrp 20
Router(config-router)# network (ipaddy)
and to our surpise it auctually worked. This allowed us to get the routing tables for the other AS and let us ping the other routers. Just thought I'd post it to show yall I found another way on my own (with the help of classmates)