From: paul cosgrove (paul.cosgrove@gmail.com)
Date: Sun Nov 30 2008 - 15:56:29 ARST
Hi Timothy,
Just wondering if you have verified that?
I know there is conflicting information about this point but the 12.4
command reference says the limit is 255.
http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_eig2.html#wp1011619
Also the field is indeed 8 bits long in the packets (see figure 4-7).
http://oreilly.com/catalog/iprouting/chapter/ch04.html
The following paper mentions the limit of 224, but only as a workaround used
on IPX networks to overcome limitations of IPX.
http://ccrg.soe.ucsc.edu/publications/interop94.pdf
Paul.
On Sun, Nov 30, 2008 at 12:49 PM, Timothy Chin <Tim@1c-solutions.com> wrote:
> The maximum definable hop count is 255 but 224 hops is the true limit.
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Oleg Konovalov
> Sent: Sunday, November 30, 2008 5:05 AM
> To: Cisco certification
> Subject: EIGRP Maximum-hop
>
> Hi all, I have question about EIGRP maximum hops, based on
> http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080
> 094cb<http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094cb>
> 7.shtml we can set up maximum 220 hops, based on some CCNP materials it
> is
> 224. I test it on my router and 255 hops was OK.
>
> Routing Protocol is "eigrp 100"
> Outgoing update filter list for all interfaces is not set
> Incoming update filter list for all interfaces is not set
> Default networks flagged in outgoing updates
> Default networks accepted from incoming updates
> EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
> EIGRP maximum hopcount 100
> EIGRP maximum metric variance 1
> Redistributing: eigrp 100
> EIGRP NSF-aware route hold timer is 240s
> Automatic network summarization is in effect
> Maximum path: 4
> Routing for Networks:
> Routing Information Sources:
> Gateway Distance Last Update
> Distance: internal 90 external 170
>
>
> Then I have changed metric maximum-hops
>
> Router(config)#router eigrp 100
> Router(config-router)#metric maximum-hops 255
> Router(config-router)#end
> Router#sh ip protocols
> Routing Protocol is "eigrp 100"
> Outgoing update filter list for all interfaces is not set
> Incoming update filter list for all interfaces is not set
> Default networks flagged in outgoing updates
> Default networks accepted from incoming updates
> EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
> EIGRP maximum hopcount 255
> EIGRP maximum metric variance 1
> Redistributing: eigrp 100
> EIGRP NSF-aware route hold timer is 240s
> Automatic network summarization is in effect
> Maximum path: 4
> Routing for Networks:
> Routing Information Sources:
> Gateway Distance Last Update
> Distance: internal 90 external 170
>
>
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