Adding Loopback interface for branch routers

Hi,
I have several branch routers that i want to add a loopback interface for managament purposes. I am currently using ospf as my routing protocol.
Will the rotuer-id be updated accordingly and will there be any effect on my ospf routing?
Thanks.

Hi,
No, the router id will not change unless you clear the OSPF process. So, this will cause an outage to your environment and should be done during a maintenance window.
from the ospf document:
OSPF automatically prefers a loopback interface over any other kind, and it chooses the highest IP address among all loopback interfaces. If there are no loopback interfaces present, the highest IP address in the router is chosen. The OSPF cannot be directed to use any particular interface. Once the router ID is elected, it does not change unless the OSPF process restarts or the router is reloaded.
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/23862-duplicate-router-id-ospf.html
HTH

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Hello all
I'm new to regex and I'm trying to make a baseline template, that will check our network devices for our required basic configuration.
What I'm trying to do is to make a template that will look for either a loopback0 or loopback1 interface.
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Message was edited by: Jesper Ross Petersen

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#Go to the tcl shell of the device.
C1811#tclsh
C1811(tcl)#
#copy and paste this at the tcl prompt.
proc intf {} {
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foreach line [split $runningcfg \n] {
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return "ip tftp source-interface $interface"
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C1811(tcl)#intf
# If loopback0 or 1 is present the tftp source interface is added to the running config.
ip tftp source-interface Loopback0
C1811(tcl)#

[svn:fx-4.0.0] 13951: Added qtp_air_rb.swc for other locales in 4.0. 0 branch

Revision: 13951
Revision: 13951
Author:   [email protected]
Date:     2010-02-02 19:17:30 -0800 (Tue, 02 Feb 2010)
Log Message:
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[svn:fx-4.0.0] 13569: Added qtp_air_rb.swc for other locales in 4.0. 0 branch

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Revision: 13569
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Added qtp_air_rb.swc for other locales in 4.0.0 branch
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---ABP thanks.
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[svn:fx-4.x] 14929: Added missing override for maxHeight to push maxHeight down to RichEditableText .

Revision: 14929
Revision: 14929
Author:   [email protected]
Date:     2010-03-22 17:45:01 -0700 (Mon, 22 Mar 2010)
Log Message:
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QE notes:
Doc notes: None
Bugs: SDK-25899
Reviewed By: Gordon
Tests run: checkintests
Is noteworthy for integration: No
Ticket Links:
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[svn:fx-3.x] 7748: Adding preview images for 3.x themes.

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Missing loopback interface and modules, and isofs mounting [SOLVED!]

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Now, I was under the impression that such facilities should be automatically available at the end of a normal installation.
For instance, in an installation I made last fall, I can mount .iso filesystem through the loopback interface with no problems (and that even without using -t, with just 'mount image.iso /mnt/iso'). In that installation, lsmod shows the modules
loop 18526 2
isofs 32946 1
(also, a module isofs is present in /lib/modules, though I cannot find a loop module there)
and eight loopback devices are available as /dev/loop0 ... /dev/loop7
On the other hand, in the new installation no /dev/loop devices are present, and no loop and isofs modules show up either
as installed (as reported by lsmod) or at least in the libraries. Has something changed recently? Do I need to install a package that will set up my installation for loopack mounting and mounting of .iso filesystems?
INTERIM SOLUTION
I mentioned above that in my older Linux box, on an Arch Linux installed months ago but not upgraded for many weeks, I had loopback devices running and isofs and loop modules installed, and all working well by itself. Today I did an upgrade, and noticed that it came with a new kernel (3.3?), probably the same I had on the new machine. So I rebooted after that---and found the exact problem as on the new machine: /dev/loop* missing, no modules isofs or loop appearing in lsmod. So I installed by hand a loopback interface, with 'mknod /dev/loop0 b 7 0'. Then I made sure I had the isofs package installed, and installed the isofs module with modprob; this time isofs showed on lsmod, but loop didn't yet. Finally I mounted a data DVD (note that the incantation -t iso9660 is no longer necessary), and as a last thing I mounted an .iso file; both worked. Only after this did a module loop show up in lsmod.
So probably something subtle changed in the dependencies between installed packages, installed modules, and installed loopback devices, so that something is out of sync and has to be nursed manually. Better experts than I may throw
some light on this problem and hopefully fix it.
FINAL AND SATISFACTORY SOLUTION
Whatever may have happened before, the following works like a charm:
I upgrade Arch; it installs 3.3.1-1-ARCH as a kernel in /boot.
I reboot to let the new kernel "take".
No loop0,...,loop7 devices show up in /dev; no isofs or loop show up with lsmod; isofs (but no loop) present in /lib/modules
I do 'mount /dev/sr0 /iso' (NOTE: no -t iso9660' option) with a CD in the sr0 drive; the CD filesystem shows up in /iso.
After this, isofs shows up in 'lsmod|grep isofs', but no loop device yet.
I unmount /iso and do 'mount ~tt/ markov.iso /iso' (NOTE: no -t iso9660' option); the markov filesystem shows up in /iso.
After this, loop0,...,loop7 devices show up in /dev, and a loop module (wherever that camefrom) appears in lsmod.
In other words, everything required for isofs automounts as necessary and remains mounted until new reboot.
The '-t iso9660' option is not necessary. As noted by an other Arch post, this option may be detrimental and might have been the culprit; this is an issue I will explore on the next reboot.
Last edited by rugantino (2012-04-11 20:11:55)

When /etc/rc.sysinit is invoked during the bootprocess; it should automatically start a loopback interface (unless you've specifically disabled it in /etc/rc.d/network or so).
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Crypto Map on Loopback interface or Physical Interface

Dear All,
When we try to apply the crypto map on any physical interface or the loopback interface on WS-6506-E, it is showing the error. But the same i could apply on VLAN interface. Can anyone explain me what is the issue..?
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Benefit of loopback interface

why do we use a loopback, is it just for when we are using routing protocols, and if say a router has 2 interfaces, the loopback can be reached from both ?

Hello Carl,
Loopback interfaces are indeed often used with routing protocols as ospf, bgp, eigrp.
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Ik you have for example a router with 3 physical interfaces all connected and your routing is configured correctly then the remote side can always reach your loopback till all paths (physical) are down.
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[svn:fx-3.x] 13209: Adding same fix for SDK-23838 and SDK-24205 to 3. x from trunk.

Revision: 13209
Revision: 13209
Author:   [email protected]
Date:     2009-12-23 15:45:53 -0800 (Wed, 23 Dec 2009)
Log Message:
Adding same fix for SDK-23838 and SDK-24205 to 3.x from trunk.
The dropDown was not receiving changes to styles nor dataproviders. This was a result of not recreating the dropDown each time it was shown. I've changed the default of the flag for destroying the dropDown to be true. I've also modified the code to only not destroy the dropDown when it is showing or being shown. I?\226?\128?\153ve also moved some of the code in the animation handler to check for a null dropDown first before destroying it.
QE notes: No
Doc notes: No
Bugs: SDK-23838, SDK-24205
Reviewer: Jason
Tests run: checkintests, ComboBox
Is noteworthy for integration: No
Ticket Links:
    http://bugs.adobe.com/jira/browse/SDK-23838
    http://bugs.adobe.com/jira/browse/SDK-24205
    http://bugs.adobe.com/jira/browse/SDK-23838
    http://bugs.adobe.com/jira/browse/SDK-24205
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Loopback interface on catalyset switches

Hello,
I need to know if I can configure loopback interfaces on L2 switches (2950) and if yes , in which IOS
Thanks
Moamen

Hello,
for admin, I need to create loopback interface and use it as the admin IP to reach the switch
I know that the admin ip configured under interface vlan1
but I'm asking because I have a switch that has the int loopback in his menu when using
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switch(config)#interface ?
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Null Null interface
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OSPF and loopback interface

Hello,
When you set a loopback interface port, do you use the same ip address as the interface configured for the area number? Example, if the interface is 192.168.0.1, will your loopback ip address be 192.168.0.1?
Do you increment the ip address for example: 192.168.0.2
Thank you,

Jason
I do not understand whether your question is asking how you configure a loopback interface or whether you are asking how you configure OSPF to process on the loopback interface.
A loopback interface is a virtual interface on a router. You assign an IP address to the loopback interface much as you would assign an address on a physical interface. The subnet mask for the loopback interface can be a normal subnet mask or it could be a host specific /32 mask (255.255.255.255). What mask to use depends on how your network is designed.
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network 172.16.1.0 0.0.0.31 area 10
network 172.16.0.0 0.0.255.255 area 10
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HTH
Rick

Adding Loopback interface for branch routers

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