1720 setup

[Guest_imported]

I'm helping to setup a 1720 for my friends business.....don't we have to find out what protocol his isp is running and run it on the cisco or is there another way....???

 

[gbiello]

If it's a simple frame-relay connection, you should know the lmi-type (ex: ansi) and the encapsulation type (ex: IETF). Either or both may be auto-negotiated at the ISP end, but I'm not sure which. I've always used those two specs, and not had a problem.

If it's a point-to-point link, you should know the encapsulation type (ex: ppp, hdlc).

 

[writemem]

gbiello has it right it is probably easier to try the three different options before calling the isp because the hold time will probably take you twice the time.

try
"encap ppp" then check for up up
or
"encap hdlc" then check for up up

or config for frame-relay lmi ansi

good luck

 

[Guest_imported]

but as far as the routing....I'm a little confused...isn't my router going to get routes from them? I was wondering what routing protocol i would have to run would it be something they tell me or am I wrong....thx for all the help!

 

[gbiello]

A routing protocol is only used when you are connecting several subnets together. If you are only connecting a single subnet to the internet, like the ethernet port out the serial, you can do perfectly well with a single default route statement, like:
ip route 0.0.0.0 0.0.0.0 s0.1, which sends all packets not destined for directly-connected networks out the serial 0.1 sub-interface.

-gbiello

 

[Guest_imported]

what about traffic from the internet back to us?

 

[writemem]

Generally when dealing with ISP's not running BGP with your router static routes are how things work. Traffic back to you is know by you isp. Your isp knows what ip's you use and where you live on the INET. This means they know how to get to you but you need to know how to get to them. Hence gbiello's static route option. If your nating then your isp see's you from one of their ip's if your not then you have one of their ip's on your host. either way isp hook up is relatively easy. Are you able to get the serial connection to show UP UP ? and is it a T-1 or Frame connection?

MARK

 

[jeter]

a 1720 router is a good router. I would however increase the dram to at least 16. Anyway if this is to be a internet connection the isp will give you a serial ip address and a ethernet ip address for example

int ser 0
ip address 208.13.12.2 255.255.255.252

int fa 0
ip address 171.1.45.1 255.255.2552.0 <- full class

I would setup a ip route

ip route 0.0.0.0 0.0.0.0 208.13.12.1 <-- your isp's int

thats all you need as far as ip's.
dont forget the DNS ( ip name-server 207.217.126.81 )are
whatever yours may be. Jeter@LasVegas.com
J.Fisher CCNA

 

[ckhanna]

Here is a common 1720 Config with a full T1:

Current configuration:
!
version 12.0
service timestamps debug datetime localtime
service timestamps log datetime localtime
no service password-encryption
!
hostname ????????
!
enable secret 5 ???????????????????????????
!
!
!
!
!
memory-size iomem 25
clock timezone pst -8
clock summer-time PDT recurring
ip subnet-zero
ip name-server ?????????????????
!
no ip bootp server
!
!
!
interface Serial0
description ??
ip address xxx.xxx.xxx.xxx 255.255.255.252
no ip directed-broadcast
no cdp enable
!
interface FastEthernet0
description ??????????
ip address xxx.xxx.xxx.xxx 255.255.255.xxx
no ip directed-broadcast
half-duplex (depends on what this plugged into)
no cdp enable
!
ip classless
ip route 0.0.0.0 0.0.0.0 s0
no ip http server
!
no cdp run
snmp-server engineID local 00000009020000B0C289BED1
snmp-server community public RO
banner motd ^C
Do not enter this router without prior written permission from ???????. If you
have any questions, please contact: 555-555-5555

^C
!
line con 0
transport preferred none
transport input none
line aux 0
line vty 0 4
password ???????????
login
transport preferred none
!
no scheduler allocate
end