Ip Forwarding Cache - HP ProCurve 6200yl Multicast And Routing Manual

IP Routing Features
Overview of IP Routing
Destination Network Mask
1.1.0.0 255.255.0.0
N o t e
5-6
Administrative Distance. The IP route table contains the best path to a
destination. When the software receives paths from more than one of the
sources listed above, the software compares the administrative distance of
each path and selects the path with the lowest administrative distance. The
administrative distance is a protocol-independent value from 1 – 255.
The IP route table is displayed by entering the CLI command show ip route
from any context level in the console CLI. Here is an example of an entry in
the IP route table:
Gateway
99.1.1.2
Each IP route table entry contains the destination's IP address and sub-net
mask and the IP address of the next-hop router interface to the destination.
Each entry also indicates route type, and for OSPF routes, the sub type, and
the route's IP metric (cost). The type indicates how the IP route table received
the route.
To configure a static IP route, see "Configuring a Static IP Route" on page 5-19

IP Forwarding Cache

The IP forwarding cache provides a fast-path mechanism for forwarding IP
packets. The cache contains entries for IP destinations. When an ProCurve
routing switch has completed processing and addressing for a packet and is
ready to forward the packet, the device checks the IP forwarding cache for an
entry to the packet's destination.
If the cache contains an entry with the destination IP address, the device
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uses the information in the entry to forward the packet out the ports listed
in the entry. The destination IP address is the address of the packet's final
destination. The port numbers are the ports through which the destination
can be reached.
If the cache does not contain an entry, the software can create an entry in
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the forwarding cache.
Each entry in the IP forwarding cache has an age timer. If the entry remains
unused by traffic for 12 - 36 seconds (depending on how full the cache is), the
software removes the entry. The age timer is not configurable.
You cannot add static entries to the IP forwarding cache.
Type Sub-Type
connected
Metric
1