Licensing Requirements For Eigrp; Prerequisites For Eigrp - Cisco Nexus 7000 Series Configuration Manual

Licensing Requirements for EIGRP

S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .
The graceful restart-capable router uses Hello messages to notify its neighbors that an graceful restart
operation has started. When an graceful restart-aware router receives a notification from a graceful
restart-capable neighbor that a graceful restart operation is in progress, both routers immediately
exchange their topology tables. The graceful restart-aware router then performs the following actions to
assist the restarting router:
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•
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After the switchover, Cisco NX-OS applies the running configuration, and EIGRP informs the neighbors
that it is operational again.
Note You must enable graceful restart to support in-service software upgrades (ISSU) for EIGRP. If you
disable graceful restart, Cisco NX-OS issues a warning that ISSU cannot be supported with this
configuration.
Licensing Requirements for EIGRP
The following table shows the licensing requirements for this feature:
Product License Requirement
NX-OS EIGRP requires an Enterprise Services license. For a complete explanation of the NX-OS licensing scheme
and how to obtain and apply licenses, see the Cisco NX-OS Licensing Guide.

Prerequisites for EIGRP

EIGRP has the following prerequisites:
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Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
8-8
The router expires the EIGRP Hello hold timer to reduce the time interval set for Hello messages.
This allows the graceful restart-aware router to reply to the restarting router more quickly and
reduces the amount of time required for the restarting router to rediscover neighbors and rebuild the
topology table.
The router starts the route-hold timer. This timer sets the period of time that the graceful
restart-aware router will hold known routes for the restarting neighbor. The default time period is
240 seconds.
The router notes in the peer list that the neighbor is restarting, maintains adjacency, and holds known
routes for the restarting neighbor until the neighbor signals that it is ready for the graceful
restart-aware router to send its topology table or the route-hold timer expires. If the route-hold timer
expires on the graceful restart-aware router, the graceful restart-aware router discards held routes
and treats the restarting router as a new router joining the network and reestablishing adjacency.
You must enable the EIGRP feature (see the
If you configure VDCs, install the Advanced Services license and enter the desired VDC (see the
Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide, Release 4.x).
"Enabling the EIGRP Feature" section on page
Chapter 8 Configuring EIGRP
8-9).
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