dundi network - redundancy / fault tolerance ?

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dundi network - redundancy / fault tolerance ?
\ Ex Vito (8 May 2008)
. \ Russell Bryant (8 May 2008)
. . \ Ex Vito (9 May 2008)
. \ Matt Watson (8 May 2008)

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Subject:	dundi network - redundancy / fault tolerance ?
Group:	Asterisk-users
From:	Ex Vito
Date:	8 May 2008

Hi list,

I'm planning a private DUNDi network for a cross-country
distributed PBX. Initially it will be composed of about 10
systems, growing to about 20.

Current requirements point to a topology of two interconnected
"DUNDi hubs", each peering with half the PBXs... This would
lead to two interconnected / inter-peered stars.

Example:

- Consider PBXs A to H
- C and E will be hubs and peer with each other
- A, B and D peer with C
- F, G and H peer with E

This leads to a maximum three hop lookup and will make
good use of current network topology / bandwidths. Of course,
should any of the hubs be unavailable and the lookup capability
is severely compromised.

Now, how to move on to acheive some kind of fault tolerance ?
According to the docs we've studied, DUNDi does not like loops
(which we assume one can limit with low enough TTLs).

Our doubts are:

- Should one use the "order" peer parameter to specify alternate
lookup paths / peers ? Is that its purpose ? If not, what is it used
for ?

- Alternatively, should one create loops in the DUNDi topology and
limit them via TTL ?

- If both options are possible, which would be the trade-offs between
them ? (Not clear at all to us!)

- Assuming any of the above is possible as a means to acheive
redundancy, which of the following topologies would your prefer ?
(hmmm, maybe I need to refresh my graph theory...) ;-)

#1 - Peer each PBX with both hubs
#2 - Duplicate both hubs and peer each PBX with its hub and
its hub dup

For better understanding, take a look at:

#1 - http://www.2photosharing.com/images/qhpnzycd7j7kf26j2f.png
#2 - http://www.2photosharing.com/images/npzbwvgnr4t079laou0.png

Thanks in advance for review and feedback.
Cheers,
--
exvito

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