Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur Page 105

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Configuring and Customizing IP
308627-14.20 Rev 00
3-45
When IP flushes a route from the routing table, it also removes the route from the
forwarding tables, thus ensuring that invalid routing information is not retained in
interface-specific caches.
An interface that receives packets that are destined for a large number of different
destinations may benefit from a larger forwarding table. The larger the number of
entries, the more likely it is that the destination will already be in the forwarding
table and the faster the route lookups will be for those destinations.
Keep in mind that configuring a forwarding table size that is larger than necessary
reduces the total amount of memory usable by other applications. On the other
hand, configuring a forwarding table size that is too small can affect overall router
performance.
Check the number of cache hits and misses to determine the optimal size of the
forwarding table. For debugging purposes, if you see the
wfIpInterfaceCacheMisses statistic going up at a rapid rate, consider increasing
the table size. However, an occasional cache miss does not warrant an increase in
the table size.
By default, IP allocates a cache for 128 destination entries on the interface. You
can specify a different cache size.
Using the BCC
To set the maximum number of entries allowed in the forwarding table, go to an IP
interface prompt (for example,
box; eth 2/2; ip/2.2.2.2/255.255.0.0
) and enter:
cache-size
<size>
size
is the number of destination entries in the cache. You can enter any integer
greater than or equal to 64.
For example, the following command causes IP to allocate a cache on interface
2.2.2.2 for 175 entries:
ip/2.2.2.2/255.255.0.0#
cache-size 175
ip/2.2.2.2/255.255.0.0#
Note:
To disable IP forwarding tables on all IP interfaces, see Enabling ISP
Mode on the Router on page 3-19.
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