Hunt Group Example - Avaya P580 User Manual

50-series
Forwarding
Engines and
Fabric Ports
Load Share
Function

Hunt Group Example

Document No. 650-100-700, Issue 1
ports are on the first Forwarding Engine, the second 12 (13-24) are on the
second Forwarding Engine, which in turn use one fabric port, the third and
fourth grouping of 12 ports each have a Forwarding Engine and use the
second fabric port. The Forwarding Engines are distributed on a one to one
basis for the 80-series Gigabit media modules. For example the 8 port 1000
TX, the first four ports have four Forwarding Engines, one for each Gigabit
port (1-4), and uses one fabric port, the other four ports (5-8) also have four
Forwarding Engines, which use the second fabric port.
On a 50-series layer 3 module, each fabric port has two Forwarding
Engines, one for layer 3 traffic, and one for layer 2 traffic. All layer 3 traffic
will be associated with one Forwarding Engine and all the layer 2 traffic
will be associated with the other Forwarding Engine.
Example, the twelve-port 10/100 layer 3 50-series media module, layer 3
traffic is coming in the first port and the last port, (ports 1,12). Using the 80-
series even distribution, the first six ports are associated with one FE and
the second six ports with the second FE, and distributed across both fabric
ports.
This is different for the 50-series modules. The twelve port layer 3 50-series
media module, all twelve ports are associated with one Forwarding Engine
for layer 3 traffic and one Forwarding Engine for layer 2 traffic. In addition
only one fabric port is used for all twelve ports.
Hunt Groups load share by directing different traffic to different ports in the
hunt group, when sending traffic to a particular user. Load sharing is done in
a round-robin fashion across the ports in a hunt group. This is based upon
BOTH the Destination MAC Address and the Source Forwarding
Engine. The Hunt Group ports on which unicast packets traverse to reach
the destination depends upon the source user's associated Forwarding
Engine.
See Figure 6-7. One port in the Hunt Group will be designated as the
"Base"/"Flood Port". All flood traffic for all VLANs is sent through this
port only. All ports are members of all VLANs associated with the Hunt
Group Base port. There are 8 non-member Forwarding Engines. Load
sharing is accomplished by using the combination of the Source Forwarding
engine and the Destination MAC Address to assign a hunt group port. Users
A and B are associated with FE#9 and therefore the first port in the Hunt
group will be used for unicast packets from A to Destination E and from B
to E. Users C and D are associated with FE#10 and therefore the second
port in the Hunt Group will be used for unicast packets from C to E and D to
E.
Using VLANs, Hunt Groups, and VTP Snooping
6-15