The problem was essentially a bug in the code of a particular vendor's ATM
carrier side equipment. I understand that problem was resolved in a code
upgrade, once the issue was identified.
Essentially, it ended up being something like this:
Customer Side IMA Carrier Side IMA
Port 1-- circuit 1 ------circuit 1---- port 1
Port 2-- circuit 2 -----circuit 2 ---- port 2
Port 3-- circuit 3 ---- circuit 3----- port 3
Port 4-- circuit 4 ---- circuit 4----- port 4
Etc etc
No it was not Cisco at the carrier side.
As long as there was a one to one correspondence between the circuit
terminated on each port on both the carrier and the customer side, there
were no problems. But if the carrier and customer side terminations did not
correspond, there were major problems with the channel dropping and loss of
all channels, not just the one. I am told it got even nastier if either the
customer side or the carrier side spanned over two IMA cards. E.g.:
Customer Side IMA Carrier Side IMA
Port 1-- circuit 1 ---|---circuit 3---- port 1
Port 2-- circuit 2 ---|--circuit 1 ---- port 2
Port 3-- circuit 3 ---|- circuit 4----- port 3
Port 4-- circuit 4 ---|- circuit 2----- port 4
Etc etc
Was a major problem.
When investigating this, I spoke to someone in one of the carriers' testing
lab, and got this story. It apparently was just one of those things. And as
I said, the problem for the particular carrier side ATM equipment was
supposed to be resolved with a code upgrade / patch
So I was wondering what your experience was. Anyone else experienced this?
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Timmons, Robert
Sent: Friday, August 25, 2000 8:41 AM
To: 'Chuck Larrieu'; '[EMAIL PROTECTED]'
Subject: RE: IMA question: WAS- How to separate Internet traffic?
Chuck,
Most disturbing.
We'll be running our own ATM network, though this is our first time
using these particular cards. We're currently running a frame-relay
between sites 1-3, but the plan is to move to a modified
hub & spoke/partial mesh using these IMA cards.
What problems did you run into?
Again, we're planning on using only 2 T1's, these are 8 port IMA cards
and we may be using more in the future. We're not doing any grouping
of the ports. Any other WAN connections will be via serial port on the
same router.
Bob
-----Original Message-----
From: Chuck Larrieu [mailto:[EMAIL PROTECTED]]
Sent: Friday, August 25, 2000 11:26 AM
To: Bob & Karen Timmons; [EMAIL PROTECTED]
Subject: IMA question: WAS- How to separate Internet traffic?
Bob, nice looking diagram.
If you don't mind my asking, what was your experience with the IMA cards?
Are you running your own ATM network? Or are you using a carrier's? Did you
have problems getting them to work?
I ask because there have been some issues with IMA with installations my
organization has done. We now know what the root cause of those problems
were, and the appropriate corrections have been made. But I wondered if you
may have experienced similar problems.
Thanks.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Bob
& Karen Timmons
Sent: Thursday, August 24, 2000 7:14 PM
To: [EMAIL PROTECTED]
Subject: How to separate Internet traffic?
We're upgrading our network soon. It'll look like the following:
http://www.erols.com/rtimmons/images/network.jpg
(I thought it better to do it in Visio than ASCII)
Each site will have 2-7206's that will each have 2 T1's mux'd via IMA cards
for 3Mb total to each HQ site. What we'd like to do is:
1. Have Internal network traffic route via RouterA and Internet traffic go
through RouterB. The network will be EIGRP only. There will be at least 1,
possibly 2 core switches behind the 7206's.
2. We'd also like to implement HSRP on all of the 7206's and have all
traffic traverse any given router if the other fails.
We're not sure if it's possible to do this. Any suggestions would be
useful.
Bob
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