Enabling EIGRP:
Router(confi)# router eigrp
Adding a network to EIGRP:
Router(config-network)# network
All interfaces belonging to the specified network will become EIGRP capable and advertised via EIGRP.EIGRP will summarize to classful boundaries by default.
An interface can be set to ''passive'' to prevent advertisement:
Router(config-router)# passive-interface
If an interface is included in the network configuration but set to passive, it will still be included in EIGRP advertisements. If an interface is not included in an EIGRP network, it will not be advertised in EIGRP.
Summarization in EIGRP
Summarization is key to preventing looping route queries (which leads to SIA condition).
Disable automatic summarization to classful addresses:
Router(config-router)# no auto-summary
Configure manual summarization on an interface:
Router(config-if)# ip summary-address eigrp
Stub Routers in EIGRP
Stub routers participate minimally in EIGRP, which reduces utilization of memory and CPU on the
router.
Often used in lieu of static routes in a hub-spoke topology to provide a standard configuration for all spoke routers.
Router(config-router)# eigrp stub [options]
receive-only - Prevents the router from advertising any routes
connected - Permits advertisement of connected networks (default)
static - Permits redistribution of static routes
summary - Advertises summary routes (default)
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