• Author : Christopher Brown

 
 

Support for transmitting more-specific routes in IPv6 RA messages

Description RFC4191 describes an optional extension to Router Advertisement messages for communicating default router preferences and more-specific routes from routers to hosts.  This feature adds support for transmitting more-specific routes via the Route Information option. Platform compatibility This feature is platform independent. Configuration This feature is configured on any layer 3 interface with switch(config)#interface ethernet1 switch(config-if-Et1)#ipv6 nd ra route-information <prefix> preference <preference> lifetime <lifetime> seconds switch(config-if-Et1)#ipv6 nd ra route-information <prefix> preference <preference> lifetime infinite <prefix> An IPv6 prefix preference <preference> The preference is either high, medium or low lifetime <lifetime> seconds The lifetime is the number of seconds for which...
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Support for neighbor cache capacity

Description ARP and IPv6 Neighbor Discovery use a neighbor cache to store neighbor address resolutions.  The capacity of the neighbor cache is determined by the resources and capabilities of the device platform. The neighbor cache capacity feature adds a means to specify a per-interface capacity for the neighbor cache. A neighboring device, through misconfiguration or maliciousness, can unfairly use a large number of address resolutions. This feature can help to mitigate this over-utilization. Platform compatibility This feature is platform independent. Configuration The cache capacity feature is configured on any layer 3 interface with switch(config)#interface ethernet1 switch(config-if-Et1)#arp cache dynamic capacity <capacity>...
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UCMP: Append Interface Speed to Received Link-Bandwidth

Description Unequal Cost Multi Path (UCMP) is a mechanism for forwarding traffic for an ECMP route by using a ratio of weights assigned to each of the route’s next hops.  This is done for BGP by disseminating BGP link-bandwidth extended community attribute information with BGP paths. The receiving device programs next hops for that route in the FIB, in the ratio of the received link-bandwidth values. The link-bandwidth value received by a device may refer to some bandwidth constraint further downstream from the sending device and thus may not take into consideration the bandwidth available on the link between the...
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IPv6 Neighbor Discovery Enhancements

The IPv6 Neighbor Discovery protocol performs Neighbor Unreachability Detection (NUD) in order to determine if two way communication with a neighboring node has failed. A neighbor is considered reachable if packets sent recently by the node have been confirmed as received by the neighbor. This can happen through a higher layer protocol such as TCP or by explicitly probing the neighbor via a Neighbor Solicitation. In normal operation, EOS will only perform NUD within a randomized range of 80-100% of the IPv6 Neighbor Cache expiry timeout. With this enhancement, EOS will perform NUD using a configured reachable time value. Platform...
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