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to the next hop along the routed path.) Once the traffic rate exceeds the
threshold, the router tries to establish a shortcut. If it can successfully
create a shortcut path, the path is used even if the traffic drops below the
threshold. The path continues to be used until the traffic stops for a period
of time. This is done to avoid going back and forth from the routed path to
the shortcut path if traffic is sporadic.
Valid values: Minimum 1 packet/second. Maximum is 5120
packets/second.
Default: 10 packets/second.
Example: set data
Data-rate threshold in packets/second [10]?
extensions
Sets the selected NHRP extension usage to
yes
or
no
.
Forward transmit NHS (default: no)
Reverse transmit NHS (default: no)
Responder Address (default: no)
Lane Shortcuts (default: yes)
Valid Values: yes or no
Example: set ext lane
Use LANE shortcuts extension [Yes]?
cache size
resolution
OR
registration
OR
server purge
Sets the selected cache’s maximum entries.
Cache sizes can be selected for any of the following:
resolution cache
This parameter lets you determine the number of entries in the cache for
client functions. Each cache entry contains the protocol address-to-NBMA
address mapping that can be used to create shortcut VCs. Entries are in
the cache when the router has:
v Successfully resolved a protocol address to an NBMA address by
sending Next Hop Resolution Requests.
v Attempted to resolve a protocol request to an NBMA address but has
either not received a reply, or has received a negative reply, and the
associated timer has not expired. These entries are kept in the cache to
prevent the device from generating additional Next Hop Resolution
Requests for some period of time.
v Received a registration request from a client and the holding time
indicated in that request has not yet expired.
When the cache size is exceeded, no new attempts are made to resolve
protocol addresses to NBMA addresses (in other words, no new Next Hop
Resolution Requests are sent) until existing entries are purged, either
because the holding time has expired or a specific purge request has been
received from the originator of the information. Also, when cache size is
exceeded, Registration Requests from new clients are rejected.
Valid values: 256 - 65535 entries.
NHRP Advanced Configuration Commands (Talk 6)
Chapter 12. Configuring and Monitoring NHRP 367