I have a question regarding OSPF behavior and the loopback address. Our
backbone is running OSPF and we have installed a Cache-Flow server to cache
webpages. The cache-flow does not support OSPF so I attempted to
redistribute OSPF into RIP. I use a private address for the loopback on all
of our
t;; "Louie Belt" <[EMAIL PROTECTED]>; "'CCIE_Lab
Groupstudy List'" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, December 01, 2000 3:35 PM
Subject: Re: OSPF Lab - DR behaviour with loopbacks WAS: RE: question about
loopback interfaces
> If y
If you remove the router ospf configuration and paste
it back, OSPF will restart with a new router ID if you
have a new high IP address. You can only do this in a
test/non-production network environment though. I've
done this before in my labs because it is faster then
waiting for the router to re
ill change.
Tony
- Original Message -
From: "Chuck Larrieu" <[EMAIL PROTECTED]>
To: "Louie Belt" <[EMAIL PROTECTED]>; "'CCIE_Lab Groupstudy List'"
<[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, December 01, 2000 1:39 AM
S
OSPF Lab - DR behaviour with loopbacks WAS: RE: question about
loopback interfaces
Yes, a convergence would occur anyway, but if the Router ID changes, a lot
more things could go wrong. For example, virtual links are configured using
the Router ID. If the router ID changes (like by having a serial inter
k B." <[EMAIL PROTECTED]>; "Chuck Larrieu" <[EMAIL PROTECTED]>;
"CCIE_Lab Groupstudy List" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Thursday, November 30, 2000 11:26 AM
Subject: Re: OSPF Lab - DR behaviour with loopbacks WAS: RE: question about
l
ick B." <[EMAIL PROTECTED]>
> To: "Chuck Larrieu" <[EMAIL PROTECTED]>; "CCIE_Lab
> Groupstudy List"
> <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Cc: "Priscilla Oppenheimer" <[EMAIL PROTECTED]>
> Sent: Thursday, Novembe
: Erick B.; Chuck Larrieu; CCIE_Lab Groupstudy List;
[EMAIL PROTECTED]
Subject: Re: OSPF Lab - DR behaviour with loopbacks WAS: RE: question
about loopback interfaces
I thought OSPF is suppose to converge whenever you have a change in the
route. I.e whenever any interface bounce.. regardless of the OSPF
ber 30, 2000 8:04 PM
Subject: Re: OSPF Lab - DR behaviour with loopbacks WAS: RE: question about
loopback interfaces
> Chuck and others,
>
> I've been following this conversation and it is a good
> review.
>
> Without a loopback interface, the OSPF RID (Router ID)
> will be the
Chuck and others,
I've been following this conversation and it is a good
review.
Without a loopback interface, the OSPF RID (Router ID)
will be the highest IP address on the router when the
OSPF process becomes active. If that interface isn't
stable (say the highest IP is on a WAN circuit) then
ou use - an address from the same
> subnet one of the interfaces is on or a seperate address?
>
>
>
>
> -Original Message-
> From: Tony van Ree [mailto:[EMAIL PROTECTED]]
> Sent: Monday, November 27, 2000 9:28 PM
> To: whitaker; [EMAIL PROTECTED]
> Subject: Re: quest
Using addresses associated with loopback interfaces (with ospf) has two
advantage :
1) The lo interface is more stable than any physical interface. It is active
when a
router boots up, and it only fails if the entire router fails.
2) The network administrator usually prefer to use a predictable o
One or two comments inset.
Chuck's Text
>>I would venture a guess that the BDR
>>would be promoted because even though there is an alternative route to the
>>DR loopback, hellos go only to adjacent routers, and the DR is no longer
>>adjacent.
>
>Well, I proved my point. Under this scenario, when
As per david's msg, it would seem that I may be entirely mistaken! (like thats a first
:)
headed back to study :)
pete
*** REPLY SEPARATOR ***
On 11/29/2000 at 8:58 AM Peter Van Oene wrote:
>One or two comments inset.
>
>Chuck's Text
>>>I would venture a guess that the BDR
>
Much as I personally rant about cross posting the two lists, I believe this
one might be worth examination from all levels.
Recall the questions and answers about the purpose of the loopback
interface, particularly in OSPF. Among the answers proposed is that the
loopback, being always up, provide
y to adjacent routers, and the DR is no longer
>adjacent.
>
>Any comments?
>
>Can't answer number 2. As my real world OSPF experience is limited.
>
>Chuck
>
>
>-Original Message-
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
>whi
-Original Message-
From: Jason Roysdon <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Tuesday, November 28, 2000 4:25 PM
Subject: Re: question about loopback interfaces
We generally have a class C range set aside for loopba
For OSPF, if no loopback address is configured OSPF
uses the highest IP address on the router being used.
This could be a WAN interface. You may be running OSPF
only on your Ethernet interface and not this WAN
interface OSPF is using for the router ID.
If the WAN interface bounces, it effects OS
Original Message-
> From: Tony van Ree [mailto:[EMAIL PROTECTED]]
> Sent: Monday, November 27, 2000 9:28 PM
> To: whitaker; [EMAIL PROTECTED]
> Subject: Re: question about loopback interfaces
>
>
> The notes I have here suggest that using a loopback interface provides a
&
ack, hellos go only to adjacent routers, and the DR is no longer
> adjacent.
>
> Any comments?
>
> Can't answer number 2. As my real world OSPF experience is limited.
>
> Chuck
>
>
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECT
if I am not wrong for some routing protocols like ospf
it needs a always up interface like a loopback
interface . Also for BGP peering with a loopback
interface makes tcp connection more reliable
suaveguru
--- whitaker <[EMAIL PROTECTED]> wrote:
> Could someone explain the importance of using
>
Any comments?
Can't answer number 2. As my real world OSPF experience is limited.
Chuck
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
whitaker
Sent: Monday, November 27, 2000 9:43 PM
To: [EMAIL PROTECTED]
Subject: RE: question about
experience. What do most of you use - an address from the same
subnet one of the interfaces is on or a seperate address?
-Original Message-
From: Tony van Ree [mailto:[EMAIL PROTECTED]]
Sent: Monday, November 27, 2000 9:28 PM
To: whitaker; [EMAIL PROTECTED]
Subject: Re: question abou
]
Subject: question about loopback interfaces
Could someone explain the importance of using loopback interfaces? I keep
reading that it is important when using routing protocols to use loopback
interfaces. A consultant that is writing documentation for me suggested I
obtain an entire class C network
Whitaker,
The advantage that I see on loopbacks interfaces is that never shutdown,
that's why in certain protocols such as OSPF and BGP they are most used..
Alex Carvalho
"whitaker" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Could someone explain the impor
Could someone explain the importance of using loopback interfaces? I keep
reading that it is important when using routing protocols to use loopback
interfaces. A consultant that is writing documentation for me suggested I
obtain an entire class C network just for loopback addresses. Cisco says
The notes I have here suggest that using a loopback interface provides a more stable
interface than a physical interface. As the loopback interface is up as long as the
RAM is working the chances of losing this interface are greatly reduced.
Both OSPF and BGP use the highest active IP address
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