CIPTV2 – Lab Update Part 1

Ok so I went ahead and firstly setup the WAN ‘cloud’ to enable IP connectivity between HQ, BR1 and BR2. (BB will be treated as a separate site but will be connected to the HQ site directly on different network segments)

Routing + Switching overview – WAN – PSTN Router to HQ – PSTN Router to BR1 – PSTN Router to BR2

The PSTN router has 3 Serial Interfaces and is acting as a Hub router.

DTE to DCE crossover cables between the PSTN router and each site.

(DCE end on the PSTN router with the clock rate set as 56000 in global configuration)

This gave me Hub and Spoke style connectivity, however there is a requirement overall for a full mesh style of connectivity. So… I put my CCNP hat back on and went ahead and configured EIGRP. I setup AS 1 on all the routers in the topology and enabled EIGRP with the ‘network’ command for each directly connected network. As a good practice I normally issue the ‘passive interface’ command globally and then specify the interfaces that I wish to participate in EIGRP. So this command was set only under the Serial interfaces connected and active on the WAN. I then added the ‘redistribute connected’ command to ‘inject’ any directly connected networks into the EIGRP process. Bingo we now have a WAN environment where all 4 routers can see one another.

The next step will be the LAN side which is to follow, but these subnets will also be advertised into the EIGRP process as they will be directly connected to each router.


This was where things got really interesting as a lot of this was fairly new to me… As I am simulating the PSTN, each site has a T1 or E1 connection back to the PSTN router using a custom crossover cable. (Which I didn’t make! I was lucky enough to have this given to me with the lab)

Anyway I cabled everything up and lights came on! I then dug out my notes on digital ports. I also did some research on how to emulate the PSTN in a home lab.

On the PSTN router I setup the T1 interfaces using ds0-group (E&M) and the E1 using pri-group (CCS). I had to add the following commands to simulate the PSTN:

(**Credit toΒ

Router 1 (PSTN SIDE)

controller E1 0/2/0
clock source internal (Because its PSTN side, it is the clock provider)
pri-group timeslots 1-31

interface Serial0/2/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5 (Im pretty sure I had to set this command in global configuration)
isdn timer T310 120000
isdn protocol-emulate network (****Simulating PSTN SIDE)
isdn incoming-voice voice
no cdp enable


Router 2 (user side)

controller E1 0/1/1
pri-group timeslots 1-31

interface Serial0/1/1:15

no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp


I had a few issues with some of the ordering of the commands, but nothing a quick Google didnt sort. Mainly around the network clock error.

I also had an issue enabling my dual T1/E1 controller, again a quick Google and the card type E1 0 0 0 needed to be set. πŸ™‚

All of the controllers are in an up state. ‘show voice port summary’ looks good. The E1 ISDN detail looks great and is all up and running. The ultimate test will be when I setup my PSTN dial peers! πŸ™‚ We shall see!

Next steps…

Setup LAN switches with appropriate subnets as per topology.

Also here are a few photos of the kit before and after:

When I got the kit out of the box……


After my WAN and PSTN configuration…


Ive also ordered some plastic racking for the phones to sit on. πŸ™‚

Im still debating about buying an actual rack… I can pick a good 12U one up on wheels for about Β£90… but this can wait for now.

More to follow.