12-27-2007 03:12 PM - edited 03-05-2019 08:11 PM
I currently have a PTP T1 that has two 1720 's configured to use bridging. I would like to use ip routing instead of bridging. My 1720's have wic-t1 cards and use Kentrix, DataSmart 658's as DSU/CSU. When I enable ip routing on local 1720 I loose my connection to the local router and the remote facility. My running-configs are below.
Br_1720#sh ru
Current configuration:
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname Br_1720
!
enable password 7 xxxxxxxxxxx
!
!
!
!
memory-size iomem 25
ip subnet-zero
no ip routing
no ip domain-lookup
!
!
!
!
interface Serial0
ip address 10.210.4.3 255.255.255.0
no ip route-cache
no fair-queue
bridge-group 1
!
interface FastEthernet0
description connected to EthernetLAN_1
ip address 10.210.4.13 255.255.255.0
no ip route-cache
speed 100
full-duplex
bridge-group 1
!
ip classless
no ip http server
!
access-list 50 permit 10.210.2.xx
access-list 50 permit 10.210.2.xx
access-list 50 permit 10.210.2.xx
access-list 50 permit 10.200.10.xx
access-list 50 permit 10.200.10.xx
access-list 50 permit 10.210.4.xx
access-list 50 permit 10.210.2.xx
access-list 50 permit 10.50.200.xx
access-list 50 permit 10.200.10.xx
snmp-server engineID local
snmp-server location Bro
snmp-server contact JE
bridge 1 protocol ieee
!
line con 0
exec-timeout 0 0
password 7 xxxxxxxxx
login
transport input none
line aux 0
line vty 0 4
access-class 50 in
password 7 xxxxxxxxxxxxxx
login
!
end
--------------------------------
Mi_1720#sh ru
Current configuration:
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname Mi_1720
!
enable password 7 xxxxxxxxx
!
!
!
!
!
memory-size iomem 25
ip subnet-zero
no ip routing
no ip domain-lookup
!
!
!
!
interface Serial0
ip address 10.210.4.2 255.255.255.0
no ip route-cache
no fair-queue
bridge-group 1
!
interface FastEthernet0
description connected to EthernetLAN_1
ip address 10.210.4.12 255.255.255.0
no ip route-cache
speed 100
full-duplex
bridge-group 1
!
ip classless
no ip http server
!
access-list 50 permit 10.210.2.xx
access-list 50 permit 10.210.2.xx
access-list 50 permit 10.210.2.xx
access-list 50 permit 10.200.10.xx
access-list 50 permit 10.200.10.xx
access-list 50 permit 10.210.4.xx
access-list 50 permit 10.210.2.xx
access-list 50 permit 10.50.200.xx
access-list 50 permit 10.200.10.xx
snmp-server engineID local
snmp-server community public RO
snmp-server location Server Room
snmp-server contact je
bridge 1 protocol ieee
!
line con 0
exec-timeout 0 0
password 7 xxxxxxxxxxxx
login
transport input none
line aux 0
line vty 0 4
access-class 50 in
password 7 xxxxxxxxxxx
login
!
no scheduler allocate
end
-------------------------------
I would like to enable RIP Version 2.
Would appreciate any help.
Thanks much.
12-27-2007 03:37 PM
1) You need to create a subnet for the WAN PTP Link
For instance on Router A:
interface Serial0
ip address 10.210.1.1 255.255.255.252
no ip route-cache
no fair-queue
On Router B:
interface Serial0
ip address 10.210.1.2 255.255.255.252
no ip route-cache
no fair-queue
2) You need to pick which site is going to keep the subnet 10.210.4.0/24.
You can't have both sites with the same IP subnet while performing routing between them.
For instance on Site A:
interface FastEthernet0
description connected to EthernetLAN_1
ip address 10.210.4.1 255.255.255.0
speed 100
full-duplex
While on Site B:
interface FastEthernet0
description connected to EthernetLAN_1
ip address 10.210.3.1 255.255.255.0
speed 100
full-duplex
Then you can configure RIP version 2
router rip
version 2
network 10.0.0.0
no auto-summary
12-27-2007 04:54 PM
Thank you for the excellent response.
I have two questions, will modifying the ip addresses break my current network connection to both routers? Also, would Proxy Arp allow me to keep my current addressing scheme?
My apologies if these questions are inappropriate.
Thanks again,
JE
12-27-2007 07:08 PM
Yes, you need to make these changes while connected to both routers via the console port.
If you can't be onsite, you can connect a modem to the aux or console port and manage the router this way.
No, Proxy ARP won't help you keeping the same addressing scheme. The router won't receive a route that it already has.
12-28-2007 06:38 AM
Thank you again. We have a "No Change Friday" policy so I won't be able to implament you instructions until next week. Have a Happy New Year!
12-29-2007 03:26 PM
Good luck and make sure to post back with results.
12-29-2007 07:46 PM
Jeff
I agree with Edison that the optimum solution is to have someone on the console port of each router making the config changes. If it is difficult to do this I have an alternative that you may consider.
- first plan out the changes that you will need to make (I agree with Edison that at a minimum you need a unique subnet for both Ethernets and for the serial link. You also need to make sure that you have the routing logic straightened out - whether it is RIP 2 or something else.
- create text files for each router with the appropriate config changes for that router.
- login to the remote router (you want to change the remote router first so that when you lose that connection you can make changes on the local router that will hopefully restore connectivity.
- schedule a reload (reload in 30 - or whatever time interval you think appropriate) so that if the config changes do not work as expected the router will reboot and will go back to the original/working config.
- tftp the text file with changes for the remote router to running config. This should apply the changes to the remote router and should lose connectivity at this point.
- login to the local router.
- cut and paste (or tftp) the changes to running config. If the config changes on both ends were well planned and correctly executed this should restore connectivity. If the changes do not work, reboot the local router and wait for the scheduled reload of the remote router.
- if the changes do work and connectivity is restored then login to the remote router, cancel the reload, and save the running config to startup config.
HTH
Rick
12-30-2007 10:25 AM
to be sure your new addressing schema is good check this
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