ISIS Two Stack Configuration
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External Switch Link Aggregation Connection Guidelines
The following table provides the recommended number of 10-Gb link aggregation connections
between ISIS Management Domains when configuring more than twelve engines. Typically, you
would not use more than one stack if your site has twelve engines or less. If planning on more
than twelve engines, it is recommended that you set up your initial ISIS environment with two
stacks. Then when you expand to more than twelve engines, the additional engines can be added
without reconfiguring your single stack environment and IP Address scheme. For information on
10-Gb link aggregation connections, see
“Configuring a 10-Gb Link Aggregation Group” on
.
For best performance each Management Domain should be balanced with the same number of
engines in both stacks. A 10-Gb link aggregation connection goes from VLAN 100 of the first
stack to the external switch and then another 10-Gb link aggregation connection goes from that
external switch to VLAN 100 on the second stack. VLAN 200 has a 10-Gb link aggregation
connection from the first stack to a second external switch and then another 10-Gb link
aggregation connection that goes from the second external switch to VLAN 200 on the second
stack. A diagram of these connections is shown in
.These four connections are considered
one
10-Gb link aggregation connection
described in the following table. You must have the same number of 10-Gb link aggregation
connections on both VLANs between the Management Domains. These connections are
bidirectional (full duplex) between the Management Domains.
Each 10-Gb link aggregation connection provides 600 MB/s bandwidth. To get the best full
bandwidth possible, you should make the 10-Gb link aggregation connections between the
Management Domains as listed in the following table. For more details on the bandwidth
between Management Domains, see the
Avid ISIS Performance and Redistribution Guide
.
Number of Engines
in First Stack
Number of Engines
in Second Stack
Number of 10-Gb Link Aggregation
Connections per Subnet
Up to 12 engines
1 engines
One 10-Gb Link Aggregation
Up to 12 engines
2 or 3 engines
Two 10-Gb Link Aggregations
Up to 12 engines
4 engines
Three 10-Gb Link Aggregations
5 or more engines
5 or more engines
Four 10-Gb Link Aggregations
