Eigrp Nonstop Forwarding - Cisco Catalyst 3120 Software Manual

Chapter 38 Configuring IP Unicast Routing
Table 38-7
Feature
NSF
NSF capability
Offset-list
Router EIGRP
Set metric
Traffic-share
Variance
1. NSF = Nonstop Forwarding
2. EIGRP NSF awareness is enabled for IPv4 on switches running the IP services feature set.
To create an EIGRP routing process, you must enable EIGRP and associate networks. EIGRP sends
updates to the interfaces in the specified networks. If you do not specify an interface network, it is not
advertised in any EIGRP update.
If you have routers on your network that are configured for IGRP, and you want to change to EIGRP, you
Note
must designate transition routers that have both IGRP and EIGRP configured. In these cases, perform
Steps 1 through 3 in the next section and also see the
You must use the same AS number for routes to be automatically redistributed.

EIGRP Nonstop Forwarding

The switch stack supports two levels of EIGRP nonstop forwarding:
•
•
EIGRP NSF Awareness
The IP-services feature set supports EIGRP NSF Awareness for IPv4. When the neighboring router is
NSF-capable, the Layer 3 switch continues to forward packets from the neighboring router during the
interval between the primary Route Processor (RP) in a router failing and the backup RP taking over, or
while the primary RP is manually reloaded for a nondisruptive software upgrade.
This feature cannot be disabled. For more information on this feature, see the "EIGRP Nonstop
Forwarding (NSF) Awareness" section of the Cisco IOS IP Routing Protocols Configuration Guide,
Release 12.4 at this URL:
http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a00804529
72.html
OL-12247-01
Default EIGRP Configuration (continued)
1
Awareness
EIGRP NSF Awareness, page 38-39
EIGRP NSF Capability, page 38-40
Default Setting
2
Enabled . Allows Layer 3 switches to continue forwarding packets
from a neighboring NSF-capable router during hardware or software
changes.
Disabled.
The switch supports EIGRP NSF-capable routing for IPv4.
Note
Disabled.
Disabled.
No metric set in the route map.
Distributed proportionately to the ratios of the metrics.
1 (equal-cost load-balancing).
"Configuring Split Horizon" section on page
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
Configuring EIGRP
38-25.
38-39