T1 Line and CISCO Router

[Flybird74]

Hello, all, this is my first time to deal with T1 line directly. We have a CISCO 2921 router, two T1 lines. The vendor provided this information and I could not find any explanation to it.
Can someone please answer the questions?

WAN Link Details:
WAN Link IP Address:122.122.122.92
AR Serial INT IP Address:122.122.122.93
CR Serial INT IP Address:122.122.122.94
WAN Link Subnet Mask:255.255.255.252

What each of the above IP for? what is AR, CR? How do you map these three IP to your router interfaces? Thanks.

 

[Carpua]

hi Flybird

122.122.122.92/30 your WAN link range 92 is the network and 95 the broadcast. which gives you two hosts 93 and 94.

CR is your side. which means your going to configure your serial port with the address 122.122.122.94/30 or 122.122.122.94 255.255.255.252.

AR is probably their side. The reason they gave you the IP address is for your routing purpose to use as the next hop. for example if you wanted to set the default route would be something like this ip route 0.0.0.0 0.0.0.0 122.122.122.93

 

[Flybird74]

Great answers! Thank you!