Obscure EIGRP limitation...not NSF capable
Came across an odd shortcoming of EIGRP while doing some research on Non Stop Forwarding (NSF) for our 7600 routers.
NSF allows routers that have redundant supervisors or RSPs to continue forwarding packets during a Stateful Switchover (SSO - i.e. one fails and the other takes over). Each routing protocol has it's own support for NSF except EIGRP which is only NSF-Aware and not NSF capable. If you don't run redundant equipment on a highly available network then this probably isn't earth shattering, but it really struck me that Cisco would leave out such a critical feature for those who have to run everything as HA.
More details on it here
EIGRP Nonstop Forwarding (NSF) Awareness [Cisco IOS Software Releases 12.2 T] - Cisco Systems
Good article from NetCraftsmen on NSF in general
Non-Stop Forwarding and Fast Re-Routing
NSF allows routers that have redundant supervisors or RSPs to continue forwarding packets during a Stateful Switchover (SSO - i.e. one fails and the other takes over). Each routing protocol has it's own support for NSF except EIGRP which is only NSF-Aware and not NSF capable. If you don't run redundant equipment on a highly available network then this probably isn't earth shattering, but it really struck me that Cisco would leave out such a critical feature for those who have to run everything as HA.
More details on it here
EIGRP Nonstop Forwarding (NSF) Awareness [Cisco IOS Software Releases 12.2 T] - Cisco Systems
Good article from NetCraftsmen on NSF in general
Non-Stop Forwarding and Fast Re-Routing
Cisco was my first networking love, but my "other" router is a Mikrotik...
Comments
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vinbuck
Member Posts: 785 ■■■■□□□□□□
I'm sure that any modern IOS is NSF capable for EIGRP.
You would think so but all the 12.4 stuff I've read says the same thing - EIGRP is nsf aware but not capable. Do you know of an IOS where it is supported?Cisco was my first networking love, but my "other" router is a Mikrotik...
