10-14-2003 10:43 PM
We are building a large Metro ethernet Network . The topology consists of BN ( cat 3550 switches ) on a GIG ethernet ring . We intend to use 14 Building node (3550)siwtches in the ring and then aggregate the Gigabit ring onto a 7609 at the Aggregation site .
Can anybody suggest whether I should use RSTP or MST and minimise the convergence/reconvergence period in cases of fiber cut on the ring .
Hrishikesh
10-14-2003 10:45 PM
Also please tell me what are the typical convergence periods on the ethernet rings on which you work ??
To waht level is the Voice and Video traffic affected
10-17-2003 12:15 PM
Of the two, RSTP is the simpler techonology, while
MST obviously scales better. There are more edge
cases to consider with MST, and we concluded it
needed lots more lab testing before we would be
comfortable with it. RSTP (in Cisco's Rapid-PVST
version) is very simple to deploy.
We are using Rapid-PVST everywhere we can.
10-17-2003 09:14 PM
Thanks Steinar ,
Does any of the fiber failures affect Voice/ Video services delivered on the Network .
What are the typical convergence times that you have experienced with RSTP
Hrishikesh
10-22-2003 02:42 AM
The re-convergence time using RSTP could be affected by the number of: nodes, mac addresses, vlans configured and L2 flows.
With 10 nodes, 400 vlans and 950 mac addresses, re-convergence has been measured to be around 1s.
Other scenario's may produce different results.
10-22-2003 10:04 PM
Then which one is the most important factor to determine the convergence time?
If I have scenario with 30 nodes, but only 1 VLAN and 200 MAC addresses, will the convergence time be dramatically increased or decreased?
Thanks!!
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