Configuring Cam Aggregation - ProCurve 9304m Diagnostics Manual

Configuring CAM Aggregation

The following sections describe features that allow you to modify the way the HP device manages the CAM:
• Programming directly connected routes into CAM as network routes
• CAM aggregation for supernet routes
NOTE: These features apply to HP devices running Enterprise software release 07.8.00 or higher.
CAM Support for Directly Connected Routes
By default, for supernet routes of directly connected routes, the HP device creates 32-bit host CAM entries for
traffic using these routes. If a network has traffic destined to a large number of different hosts, creating the 32-bit
supernet routes can consume a large portion of CAM space.
To configure the device to program directly connected routes as supernet routes in CAM, enter the following
command:
ProCurveRS(config)# ip supernet connected
Syntax: [no] ip supernet connected
This feature takes effect immediately after you enter the ip supernet connected command. CAM entries that
have already been programmed are not affected, however; consequently, you may want to save the configuration
and restart the HP device after enabling the feature.
The following is an example of how this feature works. In the example, 20.20.20.0/24 is a locally connected sub­
net. Two static routes, 20.0.0.0/8 and 20.20.0.0/16 are configured. Traffic is sent to host 20.1.1.1 using the first
parent route.
Without the ip supernet connected command configured, the following 32-bit host CAM entries are created:
ProCurveRS# show cam ip 3/1
Slot Index
3 4097 20.1.1.1/32
3 4099 20.20.20.10/32
With the ip supernet connected command configured, the following network CAM entries are created:
ProCurveRS# show cam ip 3/1
Slot Index
3 1 20.0.0.0/8
3 2048 20.20.0.0/16
3 4096 20.20.20.0/24 0000.0000.0000
Note that in the second CAM entry displayed (20.20.0.0/16), the age is shown as disabled. This is because this
CAM entry is created when its parent is created, but since the entry is never used, it would normally be timed out
eventually. However, since its parent is still in the CAM, it should not be timed out. Instead, aging for the CAM
entry is disabled.
For the third CAM entry, created for the locally connected route (20.20.20.0/24), the outgoing interface is shown as
"FID unused". This indicates that packets using this route are forwarded by the CPU.
In addition, if a host CAM entry for the supernet route had already existed prior to when the ip supernet
connected command was configured, it is not removed by enabling this feature. In the example above, if a host
entry for 20.20.20.10/32 had already existed, enabling this feature does not remove this entry. When the CAM
entry ages out, traffic for this destination would be forwarded using the network CAM entries.
June 2005
IP_Address
00e0.52da.c347
0050.da27.62cb
IP_Address
00e0.52da.c347
00e0.52da.c347
MAC Age
1
1
MAC Age
0 1
dis 1
1 N/A
Changing CAM Partitions
VLAN Out Port
1 ether 3/9
1 ether 3/1
VLAN Out Port
ether 3/9
ether 3/9
FID unused
5 - 7