From: Timothy Chin (Tim@1c-solutions.com)
Date: Sun Nov 30 2008 - 17:05:01 ARST
Hi,
I know there has been conflicting information on this for awhile. I
don't know why but the 12.4 command reference for IPv4 doesn't provide
this information but the IPv6 reference does specify the maximum network
width:
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-eigrp_p
s6441_TSD_Products_Configuration_Guide_Chapter.html
I don't see an update on the 12.4 IPv4 documentation regarding this but
going by previous releases I figure it would still be the same. From
what I know a maximum hop count of 255 can be configured but traffic
would only traverse 224.
________________________________
From: paul cosgrove [mailto:paul.cosgrove@gmail.com]
Sent: Sunday, November 30, 2008 12:56 PM
To: Timothy Chin
Cc: Oleg Konovalov; Cisco certification
Subject: Re: EIGRP Maximum-hop
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.h
tml#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_paper09186a008
0094cb>
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
Blogs and organic groups at http://www.ccie.net
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