Instruction manual

Configuration Changes Since Release 4.0
296-1011-220 Rel. 4.1, Doc. Rev. 07.02 2-15
New Functionality
Route Aggregation for IP Pools
The CVX switch applies route aggregation to local IP address pools when
possible. Route aggregation is a method of collecting a large number of host
routes into one encompassing network route to save routing table space and
streamline RIP and/or OSPF updates.
When you set the count attribute (under the ip_address_block object) to an even
power of two (that is,
2, 4, 8, 16, etc.) and set a start attribute which would be the
beginning of the associated subnet, the CVX switch converts the IP pool to
include a "mask" that encompasses the same address range.
count mask
----- ---------------
2 255.255.255.254
4 255.255.255.252
8 255.255.255.248
... ...
This reduces the availability of one IP address from the pool. This is because the
CVX switch can never assign the network address of an IP subnet.
CVX> config sessions/vpop 1/ip_pool 1/ip_address_block 1
Entering Configuration Mode
.../VPOP 1/ip_pool 1/ip_address_block 1> set start 10.10.10.1
.../VPOP 1/ip_pool 1/ip_address_block 1> set count 4
.../VPOP 1/ip_pool 1/ip_address_block 1> commit
The above example indicates the configuration of four IP addresses available to
the users in VPOP 1, IP pool 1.
Note: The information in this section is not fully documented in the CVX 1800
Access Switch Command Reference for CVX Release 4.0. Use this information
in conjunction with your documentation CD-ROM.