[mrtg] Re: SNMP Interface

[Nick Jones]

When you add an interface to a router it will reassign the index numbers
when the router is rebooted.  Cisco finally fixed this problem in IOS
version 12.1(5)T with a feature called "Interface Index Persistence".
Once you enable Interface Index Persistence you can run cfgmaker and
monitor all of the interfaces that are currently on the router.  The
next time you add an interface just make sure you add it to MRTG.
Another problem we've run into is changing the IP we're monitoring.  In
that case you can setup a loopback interface.  Hope this helps.




Regards,

Nick Jones CCNA, CCDA, MCSE, CCA
nick at ipgod.net
713.590.2341 x5721

 -----Original Message-----
From: 	Edgardo Mina [mailto:edgardo at staff.singnet.com.sg] 
Sent:	Sunday, May 27, 2001 10:33 PM
To:	mrtg at list.ee.ethz.ch
Subject:	[mrtg] SNMP Interface


Hi everyone,

currently I am monitoring a dynamic router, meaning every day our
network 
engineers do some changes in our router, like adding new link on the 
interface of the router, or removing some. the problem is when we add
new 
interface or new link on the router we always end up getting same
interface 
for IfIndex, sample is this
we add new link with IP 10.10.10.10
when we do snmpwalk router community ipAdEntIfInddex.10.10.10.10 we get
result

ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex.10.10.10.10 = 23
ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex.IP = interface

if someone is already using interface 23 there would be a conflict with 
other interface or IP
eg:

ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex.10.10.10.11 = 23
ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex.10.10.10.8 = 23
ip.ipAddrTable.ipAddrEntry.ipAdEntIfIndex.10.10.10.6 = 23

and since cfgmaker is baseline on the interface number, what will happen
is 
that it will only give one of this interface, instead of the 3 IP, IOS 
version of router is 12 (cisco), why is it so, is there a way to solved 
this problem, since we are running cfgmaker twice daily to cope up with
the 
changes on the router.

Hoping that someone can help me on this.

regards


--
Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Archive     http://www.ee.ethz.ch/~slist/mrtg
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi




--
Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Archive     http://www.ee.ethz.ch/~slist/mrtg
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi