EIGRP doubt

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EIGRP doubt

Postby m1607 » Fri Jul 22, 2011 4:33 am

Hello,

In eigrp with command sh ip eigrp topology summary
Just want to know meaning of term Head serial and next serial

Thanks for help in advance

Switch#sh ip eigrp 1 topology summary
EIGRP-IPv4 Topology Table Summary for AS(1)/ID(10.1.1.1)
Head serial 1, next serial 2
1 routes, 0 pending replies, 0 dummies
Enabled on 1 interfaces, 1 neighbors present on 1 interfaces
Quiescent interfaces:
Fa0/24
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Re: EIGRP doubt

Postby aaronbalchunas » Sat Jul 23, 2011 9:37 am

Moved this topic to the Routing forum, as it relates to EIGRP.

There is not alot of information out there regarding your question. The clearest answer I can find is here on page 8:

https://learningnetwork.cisco.com/servlet/JiveServlet/previewBody/10484-102-1-38637/EIGRP.pdf

"Serial" in this context does not refer to an interface, but rather a serial number identifying the EIGRP topology database revision number. I will assume that "head serial" refers to the first revision, and "next serial" refers to the current version (or perhaps the next revision, it's a little unclear). Any time a topology change occurs, the "next serial" number is incremented by one.

If this number is incrementing often, then your EIGRP domain is likely unstable.

- Aaron
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