Saturday, 19 March 2011

IGRP

 (Interior Gateway Routing Protocol): Cisco proprietary distance-vector routing protocol.  Uses bandwidth, and delay as default metrics, and
can also use reliability, load and Maximum Transmission Unit (MTU).  IGRP can load-balance up to six unequal links.  Routing information
messages are sent every 90 sec by default.

(config)#router igrp ASnumber: enables RIP, but only shares information between the routers on the same autonomous system (AS).
(config-router)#network network: limits the propagation of the RIP messages to the network.
(config-router)#variance multiplier: number between 1 and 28 which controls the load balancing between the best and worst metric.
(config-router)#traffic-share balanced/min: share inversely proportional to metric or only routes that have minimum cost.

Other Routing Commands:
sh ip route: shows the routing tables.   Also shows the administrative distance of each link, the hop count, the next hop and exit interface.
sh [ip] protocols: network layer address of each interface or (with ip) the routing protocols on the router and timers used.
debug ip rip/(igrp events/transactions): rip and igrp transactions send routing updates to the console. igrp events only sends a summary,
including the destination and provenance, and the number of routers included in each message.
undebug all: turns off debugging.  show debug will show what debug options are turned on.
ping address: verify connectivity with remote hos

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