11-22-2004 09:04 AM
Hi,
I have recieved one configuration file.
There the loopback IP is defined whereas it's a point to point connection where i think one serial,ethernet and e1 controller is required.
Can anyone suggest me why this loopback address in being use in the conff...
sh run
Building configuration...
Current configuration : 2375 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname rhclvoip
!
boot-start-marker
boot-end-marker
!
logging buffered 51200 warnings
!
username xxxxx privilege 15 secret xxxxx
clock timezone MST -7
clock summer-time MSTDST recurring
no network-clock-participate slot 1
no network-clock-participate wic 0
no network-clock-participate aim 0
no network-clock-participate aim 1
voice-card 1
dspfarm
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
no ip domain lookup
ip domain name yourdomain.com
ip ips po max-events 100
no ftp-server write-enable
!
!
voice rtp send-recv
!
!
!
!
!
!
!
!
!
!
!
!
!
!
controller E1 0/0
channel-group 0 unframed
!
controller E1 1/0
framing NO-CRC4
ds0-group 0 timeslots 1-15,17-30 type e&m-melcas-immed
!
!
!
!
!
interface Loopback0
ip address 192.168.10.60 255.255.255.255
!
interface FastEthernet0/0
description $ETH-LAN$$ETH-SW-LAUNCH$$INTF-INFO-FastEthernet 0/0$
ip address 10.10.10.1 255.255.255.248
duplex auto
speed auto
!
interface Serial0/0:0
ip address 192.168.10.58 255.255.255.252
!
interface FastEthernet0/1
description uplink to hcl switch
no ip address
shutdown
speed 100
full-duplex
!
ip classless
!
ip http server
ip http authentication local
ip http secure-server
!
!
!
!
!
!
control-plane
!
!
!
voice-port 1/0:0
!
!
!
!
!
dial-peer voice 61 pots
destination-pattern 7....
port 1/0:0
forward-digits all
11-29-2004 07:07 AM
I don't think there is any correlation between the loopback address and the voip configuration. It could have been done for administrative purposes too.
11-30-2004 09:21 AM
Some reasons.
From WAN standpoint, when you have a remote router with multiple links, it is better to point the dial peers to a loopback address. If one of the links die, you still have connectivity to the loopback.
On this example, only one WAN interface, it makes sense to use the loopback if you have voice peers on both sides WAN and LAN.
Assume you don't configure a loopback interface and your dial peers points to Ethernet address. If you loose the ethernet link, you also loose all your voice. Even if the WAN link and WAN voice peers are OK.
The same applies to LAN voice peers pointing to WAN interface.
If you have only one entry interface for voice traffic, adding a loopback interface does not makes sense.
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