S2 IP setting on Nortel 1140E

[mrclean0613]

Greetings ~

Can someone tell me what the S2 IP field is used for?

We have approximately 178 1140E phones installed - I see there is no IP address populated for the S2 IP

We're preparing for our "Failover Test" in two weeks

Does this field need to have the Alternate SS IP address?

Thanks,

mrclean613

 

[spanton]

Yes if you have a alternative SS in the environment then you should populate the S2 with that IP address.

 

[oldestgeek]

Don't use the SS address in either S1 or S2. You should use the node IP in S1 and if you have an alternale node with spare licenses, put that in S2 for redundancy. If you have no other node, leave S2 all zeros or use the same address as S1. It can also be used in a Branch Office to redirect sets to the main office in the event of a complete call server failure at the BO, but there are restrictions. See the BO user guide before programming this way.

 

[mrclean0613]

OK - yeah... that's what my research is showing - to use the node IP

Now this leads to how determine if we have redundancy capability. Here's what we have in place

main office (MO) - CS1000M w/14 MGC's
Main Office - recently installed backup SS w/ backup NRS

Admin Office (AO) - CS1000E - CPU-0 CPU-1 7ea MGC's - Primary NRS - no PSTN - We have Tie trunks to MO for PSTN access

Branch Office (BO) - CS1000B - PRI to PSTN

The question we have is how to create redundancy at our MO - we have 270 1140e phones installed

What happens to the MO phones if we loose S1?

 

[oldestgeek]

OK - here's what happens. You have first-line redundncy through your two CPUs. If the active CPU fails, the other takes over and starts call processing. Both are in the S1 node, so you won't lose S1 by losing a CPU. You don't mention where your primary SS is but that is normally where S1 lives. In the event of a failure of the primary SS or connectivity to it, the follower (backup)SS becomes the leader of the node and responds to TPS requests for the S1 address. The weak point I see in the design is at the Admi9n location where you have no trunks. Those dual CPUs won't help you if the tie lines go down. Is the CS1000M or the CS1000E your S1? You could acheive additional redundancy by making S2 the node on the other switch but you would need to purchase additional IP client licenses for the S2 switch. You would also have to be careful in programming the TNs as the TN would have to be same in both switches or you would have to re-enter the TN manually to switch from S1 to S2 registration.

 

[mrclean0613]

Hmmm - I truly appreciate your knowledge in this arena. I've been trying to figure this all out on my own - drilling through Nortel docs.

MO Primary SS is homed in telecom room with the CS1000M

The CS1000M is my S1

I don't quite follow you on achieving additional redundancy by making S2 the node on the other switch but you would need to purchase additional IP client licenses for the S2 switch. You would also have to be careful in programming the TNs as the TN would have to be same in both switches or you would have to re-enter the TN manually to switch from S1 to S2 registration.

Are you saying that the CS1000E would have to have enough IP client licenses? And we'd need to have all 270 TN's built (1140e phones from S1)

Thanks again for your expertise