Thanks Leslie for your input. I think it makes clearer why I
don't see any problem:
- all routers have loopbacks with IP addresses corresponding to the
main DNS name of the router. This DNS name is used in the seed file
to discover the router -> so no discovery problem
- we don't have unnumbered serials
- for traps, in recent IOS version, you can force the router to sent
traps with always the loopback as source address.
So, like you suggest, for the moment I will keep this configuration, since
our operator are used to it. But I will keep in mind that it is
not recommended.
Thierry
On 26.06.2001 05:00:49 "Leslie Clark" wrote:
>More on how important this is:
>
>It used to cause Netview to sometimes make multiple nodes. At
>current code levels it is much better at resolving this. However,
>it will be labeled by the interface it was discovered by, which may
>not be desirable. Also, I think there can be some problems with
>connecting unnumbered serials, as Netview will try to use information
>in the CDP to find next hops, and if Netview and the router don't agree
>on the naming, there could be some problems there. Other problems
>that can occur: Traps that come in from those devices will have their
>addresses resolved to something other than the node name. This means
>you will not be able to use the 'Options...Highlight Node on Map'
function,
>nor the 'Monitor...Events...Current Events' function.
>
>None of this is really critical except some possibly problems with
>discovery under some of the wierder circumstances, so you need to
>weigh this against the benefit you gain for traceroutes. That is one
>reason, by the way, that I hear a lot. I would say do it the way you are,
>if your operators are used to it, and if you have problems discovering
>something occasionally, add a bunch of entries to /etc/hosts just for that
>router to get it discovered correctly.
>
>Cordially,
>
>Leslie A. Clark
>IBM Global Services - Systems Mgmt & Networking
>Detroit
>
>
>Rick_Reed@tivoli.com@tkg.com on 06/25/2001 10:40:53 AM
>
>Please respond to IBM NetView Discussion <nv-l@tkg.com>
>
>Sent by: owner-nv-l@tkg.com
>
>
>To: IBM NetView Discussion <nv-l@tkg.com>
>cc:
>Subject: Re: [NV-L] Object Label
>
>
>
>
>Thierry,
>
>It is important to NetView that all of the interfaces on a device resolve
>to the same hostname. It is, however, possible to create an "alias" for
>each interface.
>
>For example...
>
>10.10.1.1 myrouter myrouter_ser0
>192.168.14.2 myrouter myrouter_ent0
>192.168.15.2 myrouter myrouter_ent1
>
>This technique preserves the unique interface name requirement, and keeps
>NetView happy. : - }
>
>Rick Reed
>E-Mail address rick.reed@tivoli.com
>PCS & Voice Mail 919-696-7953
>Message via E-Mail 9196967953@messaging.sprintpcs.com
>Message via Web http://www.messaging.sprintpcs.com/sms/
>
>
>
>
> thierry.van-mol@
> ciev.vd.ch To: IBM NetView Discussion
><nv-l@tkg.com>
> Sent by: cc:
> owner-nv-l@tkg.c Subject: Réf. : RE: [NV-L]
>Object Label
> om
>
>
> 06/25/2001 04:37
> AM
> Please respond
> to IBM NetView
> Discussion
>
>
>
>
>
>
>
>I am confused with Don Davis mail:
>
>- in the manuals of Campus Manager (part of CiscoWorks 2000) Cisco System
> says that you should have all interfaces that resolves to the same
> name (maybe you are referencing another configuration guide of Cisco)
>
>- in our network, we always had different DNS names for all the interfaces
> of every router. This is useful if you do a traceroute. We have
> about 450 routers, but I have never seen Netview ending up with
> multiple routers due to this DNS configuration.
>
>Is it really a Netview requirement to have all the interfaces resolving to
>the same name? If there is some good reason, I am ready to change my
>DNS configuration.
>
>
>Thierry
>
>
>
>
>
>
>On 22.06.2001 20:15:07 "Davis, Donald" wrote:
>>The Interface LABEL will never display anything other that the IP
Address
>of
>>that interface.
>>The event log will display the resolved name of the Router (not
>interface) if
>>it can be resolved.
>>If your DNS has different names for each interface on a router (as Cisco
>>Systems suggests) then you MUST prevent NetView from
>>using DNS for those IP Addresses. You will end up with multiple routers
>where
>>only one should be drawn.
>>DNS overrides NetView's logic as to what interfaces belong to a
>particular
>>device.
>>
>>My recommendation is:
>>If you have multiple names for the same router in DNS, fix your DNS.
>>Get those "unique interface names" out of there or NetView will be
>severely
>>confused.
>>Do not allow NetView to use a DNS for those routers!
>>Override it as I previously suggested with /etc/hosts and
>/etc/netsvc.conf.
>>
>>If you do not or cannot (politics) manage your DNS, then this is your
>only
>>solution.
>>Example etc/hosts file:
>>
>>10.1.1.1 ciscoXYZ # Main IP Address
>>10.2.1.1 ciscoXYZ # Serial2/0
>>10.3.1.1 ciscoXYZ # Serial2/1
>>10.4.1.1 ciscoXYZ # FastEthernet0/0
>>10.5.1.1 ciscoXYZ # FastEthernet1/0
>>10.6.1.1 ciscoXYZ # FastEthernet3/0
>>
>>Note that every interface on router ciscoXYZ resolves to the same
>hostname !!!
>>This is VERY important !!!
>>
>>James, Feel free to jump in here... :)
>>
>>Don Davis
>>
>>
>>-----Original Message-----
>>From: Stamper, Steve [mailto:Steve_Stamper@foremost.com]
>>Sent: Friday, June 22, 2001 12:54 PM
>>To: 'IBM NetView Discussion'
>>Subject: RE: [NV-L] Object Label
>>
>>
>>Ya but.... What if you have specific interfaces with labels in the
DNS?
>How
>>can you get the interface to pickup the Name and not the IP Address?
>>
>>
>>
>>Thanks² - Steve Stamper
>>
>>-----Original Message-----
>>From: Davis, Donald [mailto:donald.davis@firstcitizens.com]
>>Sent: Friday, June 22, 2001 11:11 AM
>>To: 'IBM NetView Discussion'
>>Subject: RE: [NV-L] Object Label
>>
>>
>>Santosh,
>>Placing an entry in /etc/hosts will cause NetView to update the
selection
>name
>>when the node is demand (or configuration) polled.
>>When you demand poll the node after putting the sysname in
/etc/host, you
>
>>should see "New name found ...." in the output window.
>>The label of the node will change to this new name. The label of the
>interface
>>itself will Always be the IP Address.
>>I have been told that the label change may not happen immediately,
>depending
>>how busy NetView is doing other things.
>>
>>This entry in /etc/hosts will cause the SelectionName and thus the label
>to be
>>updated with "SuperXyzRouter".
>>/etc/hosts
>>10.2.3.123 SuperXyzRouter # Comment
>>
>>Be certain that you have an /etc/netsvc.conf file and it is configured
>like
>>this:
>>
>>/etc/netsvc.conf
>>hosts=local,bind4
>>
>>(The number after bind is the version of bind that you are running.)
>>If you have not configured /etc/resolv.conf for a nameserver, the
>netsvs.conf
>>file is not needed.
>>This will cause the OS to check /etc/hosts before going to DNS.
>>
>>Don Davis
>>
>>
>>-----Original Message-----
>>From: z_esm_karekars [mailto:z_esm_karekars@bharatpetroleum.com]
>>Sent: Friday, June 22, 2001 4:00 AM
>>To: 'IBM NetView Discussion'
>>Subject: RE: [NV-L] Object Label
>>
>>
>>
>>Hi Don,
>>
>>Can U please be little clear on this, I could enter the Interface IP
>addresses
>>in /etc/hosts file locally ( Infact I had done it earlier but could not
>work
>>on that more that time. I tried demand poll after I did the same which
>did not
>>helped me) How will the interface pickup the Name from hosts file then,
>please
>>advice.
>>
>>Regards,
>>Santosh
>>
>>----------
>>From: Davis, Donald[SMTP:donald.davis@firstcitizens.com]
>>Reply To: IBM NetView Discussion
>>Sent: Thursday, June 21, 2001 7:47 PM
>>To: 'IBM NetView Discussion'
>>Subject: RE: [NV-L] Object Label
>>
>>Santosh,
>>NetView does NOT do this natively (like HP OpenView does). NetView uses
>only
>>the resolved name.
>>The workaround is to write a script that does an SNMPGET for the sysName
>and
>>writes it to /etc/hosts so that NetView can resolve to that insted of
the
>DNS
>>name. You will need to modify /etc/netsvcs.conf so that local comes
>before
>>bind.
>>
>>
>>Don Davis
>>
>>-----Original Message-----
>>From: z_esm_karekars [mailto:z_esm_karekars@bharatpetroleum.com]
>>Sent: Thursday, June 21, 2001 9:59 AM
>>To: 'nv-l@tkg.com'
>>Subject: [NV-L] Object Label
>>
>>
>>Hi,
>>
>>I had Netview 6.0.1 on AIX 4.3.3.
>>
>>How can the Router Interfaces pick up the System Description
>>"RouterName:I/FName" in place of IP address which comes by default.
>>
>>It's very very urgent.
>>
>>Regards,
>>Santosh
>>
>>
>
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