This option adds an explicit interface definition to enable or disable NHRP on an interface. If NHRP is disabled on a particular network interface, NHRP packets are not forwarded to any routers that are reached via that interface. Also, incoming NHRP frames are discarded.
The Next Hop Resolution Protocol (NHRP) defines a method for a source station to determine the Non-Broadcast Multi-Access (NBMA) address of the next-hop towards a destination. The NBMA next-hop may be the destination itself or the egress router from the NBMA network that is nearest to the destination station. The source station can then establish an NBMA virtual circuit directly with the destination or the egress router and reduce the number of hops through the network.
A hop is an operation performed by a traditional router when forwarding packets from one subnet to another. In particular those operations are (1) doing a lookup on a layer 3 subnet identifier (2) determining the outbound next hop for the packet (3) stripping and replacing the layer 2 packet header, removing ingress link information and adding egress link information. So, for 1-hop routing this operation happens once during transfer of a packet from its source to its destination.
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This option adds an exclude list entry for a protocol address that should be excluded from the NHRP network.
Valid Values: any valid IP address
Default Value: 0.0.0.0
Valid Values: any valid IP address mask
Default Value: 255.255.255.255
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This option adds a router protocol address to which shortcuts are not allowed.
Valid Values: any valid IP address
Default Value: 0.0.0.0
Valid Values: any valid IP address mask
Default Value: 255.255.255.255
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This option deletes an explicit NHRP interface definition
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This option deletes an exclude list entry for a protocol address that should be excluded from the NHRP network.
Use the LIST EXCLUDE LIST command to determine the index of the entry you want to delete.
Valid Values:
Default Value: none
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This option deletes a router protocol address from the disallowed router shortcut list.
Use the LIST DISALLOW SHORTCUT command to determine the index of the entry you want to delete.
Valid Values:
Default Value: none
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This option allows you to change the interface NHRP definition to either enable or disable an NHRP interface.
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This option allows you to change an exclude list entry for a protocol address that should be excluded from the NHRP network.
Valid Values: any valid IP address
Default Value: 0.0.0.0
Valid Values: any valid IP address mask
Default Value: 255.255.255.255
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This option allows you to change a router protocol address on a router shortcut list.
Use the LIST DISALLOW SHORTCUT command to determine the index of the entry you want to delete.
Valid Values:
Default Value: none
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This parameter determines how the protocol layer access controls will be applied to the NHRP packets. NHRP implementation checks the IP filters, packet filters, and access controls when requesting, forwarding, and providing shortcut routes.
You can select whether to use the source and destination or destination only protocol address of the NHRP packet to check against the configured protocol filters.
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This option allows you to select whether the NHRP client will originate resolution requests always, never, or based upon data rate.
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This option allows you to set the holding time (in minutes). The holding time parameter is used for these functions&colon.
Valid Values: 1 - 60 minutes
Default Value: 20 minutes
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This option allows you to set the data rate threshold. The datarate threshold is used when the attempt shortcuts parameter is set to Data-rate.
When traffic is destined for a particular station, but the rate is less than this threshold, then the MSS does not attempt to establish shortcuts. (In other words, it does not generate Next Hop Resolution Requests and send them to the next hop along the routed path.) Once the traffic rate exceeds the threshold, the MSS 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: 1 - 5120 packets per second
Default Value: 10 packets per second
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This option allows you to set the forward NHRP extension usage.
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This option allows you to set the NHRP Reverse extension usage.
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This option allows you to set usage of NHRP Extensions Responder Address.
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This option allows you to set the usage of NHRP Extensions LANE shortcuts.
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This option allows you to 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 MSS has:
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
Default Value: 512 entries
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This option allows you to set a limit on the number of registration entries in the resolution cache. When the server receives a registration request, it checks to see if the number of NHRP client registrations is below this limit before adding a registration entry in the resolution cache.
Valid Values: 0 - 16384 entries
Default Value: 512 entries
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This option allows you to determine the number of entries in the server purge cache. An entry in this cache represents a destination protocol address and a client to which the server has provided Authoritative NBMA information for that destination.
The destination address may represent the server itself, devices on subnetworks to which the server is attached, NHRP clients that have registered with the server, or routers for which a R2R shortcut has been advertised. The MSS uses the information in these cache entries to notify clients to purge address information that becomes invalid before the holding time expires.
When the server purge cache size is exceeded, the server rejects Authoritative Next Hop Resolution Requests.
Valid Values: 256 - 65535 entries
Default Value: 512 entries
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This option allows you to
Use the LIST command to determine the valid interface numbers.
Default Value: 0
Valid Values: 0 - 255
Default Value: 0
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This option allows or disallows shortcuts to ATMARP clients.
This parameter can be used to allow or disallow the MSS server from giving out shortcuts to native ATMARP clients that do not support NHRP. This may be required if these clients are not capable of supporting large number of VCs. Use the Exclude List option if shortcuts need to be disallowed selectively to certain clients or subnets.
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