05-31-2005 05:28 PM
We would like to use our 3845 to support dial backup from our remote routers when the main frame line goes down. We will have remote routers that will use ISDN and some will have to use a wic-1am for analog(async) dial. I have two questions:
1. Will my 3845 support such a configuration with a T-1 PRI module installed.
2. Based upon the assumption that it will work, is the following router configuration mock up going to work.
version 12.3
service timestamps debug datetime localtime
service timestamps log datetime localtime
service password-encryption
!
hostname CENTRALPRI
!
username xxxxxxxxxxxxxpassword 7 xxxxxxxxxxxxxxxxxx
username xxxxxxxxxxxxxxpassword 7 xxxxxxxxxxxxxxx
!
aaa new-model
!
aaa authentication login default group tacacs+ line
aaa authentication enable default group tacacs+ enable
aaa authentication ppp default local
aaa authorization exec default group tacacs+ none
aaa authorization commands 15 default group tacacs+ none
aaa accounting update newinfo
aaa accounting exec default start-stop group tacacs+
aaa accounting commands 15 default start-stop group tacacs+
aaa accounting system default start-stop group tacacs+
aaa session-id common
ip subnet-zero
!
ip cef
ip tcp synwait-time 5
!
isdn switch-type primary-ni
!
controller T1 6/0
framing esf
linecode b8zs
pri-group timeslots 1-24
description ISDN PRI CKT#xxxxxxxxxxxx
!
interface FastEthernet0/0
ip address 172.16.1.1 255.255.255.0
duplex full
speed 100
!
interface Serial6/0:23
description ISDN PRI - #xxxxxxxxxxxxx no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type primary-ni
ppp authentication chap
ppp multilink
!
interface Group-Async0
no ip address
encapsulation ppp
dialer in-band
dialer pool-member 255
async default routing
async mode dedicated
no fair-queue
ppp authentication chap
no group-range
!
interface Dialer2
description Dialer Interface for xxxxxxxxxxxxxx- Remote ISDN Site Dial-in Interface
bandwidth 1
ip address 192.168.66.29 255.255.255.252
encapsulation ppp
dialer pool 1
dialer remote-name xxxxxxxxxxxx
dialer idle-timeout 200
dialer-group 1
ppp authentication chap
ppp multilink
!
interface Dialer40
description Interface for xxxxxxxxxxx- Remote Modem Site Dial-in Interface
bandwidth 1
ip address 192.168.16.21 255.255.255.252
encapsulation ppp
dialer pool 255
dialer remote-name xxxxxxxxxxxx
dialer idle-timeout 200
dialer-group 2
ppp authentication chap
ppp multilink
!
router eigrp 1
network 192.168.16.20 0.0.0.3
network 192.168.66.28 0.0.0.3
network 172.16.1.0 0.0.0.255
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.1.254
!
access-list 101 deny ip any host 224.0.0.10
access-list 101 deny eigrp any any
access-list 101 permit ip any any
!
access-list 102 deny eigrp any any
access-list 102 permit ip any any
!
dialer-list 1 protocol ip list 101
dialer-list 2 protocol ip list 102
06-03-2005 01:20 PM
Jon, did you ever figure this out? I have the exact same issue.
06-04-2005 04:25 AM
Here is what I've been able to compile so far:
PRI Modules I'll need:
NM-1CE1T1-PRI 1-port Channelized E1/T1/ISDN-PRI network module
NM-2CE1T1-PRI 2-port Channelized E1/T1/ISDN-PRI network module
We are getting the one port version.
Digital Modems:
NM-6DM 6-digital-modem network module
NM-12DM 12-digital-modem network module
NM-18DM 18-digital-modem network module
NM-24DM 24-digital-modem network module
We will need one of these to terminate the analog (async) calls that come in over the digital PRI circuit. I was told by TAC that the incoming ISDN calls would work just fine with one the PRI module and these digital modems were needed only for the analog calls. Which means we should be able to size our digital modem module according to the ratio of analog calls we think we will be getting on the PRI line. I believe we are getting either the 6 or 12 modem version as these modules aren't cheap. (They also make a 30 modem module - but I'm in the US using a T1 line)
Here are the TAC proposed additions to the posted config:
Serial 0:23
isdn incoming-voice modem
interface Group-Async0
dialer idle-timeout 900
dialer-group 2
ppp multilink
group-range 1 24 (or whatever your modem numbers are)
line 1 24
no flush-at-activation
modem InOut
transport input all
modem autoconfigure type mica
TAC said my individual dialer interfaces with the /30 addresses would work. Which is what I want so I can run EIGRP over the backup lines to support the remote LAN failover.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide