Like all posters, yes, the router-id is just any random 32-bit number. So a
nice question always is, if 250.255.1.1 is a valid router-id, the answer is
Yes of course :-)
For setting-up the virtual-links you enter the router-id of the other ABR,
the path to this 'number' is queried from the OSPF topology table where a
LSA type 1 resides with this information.
R2
!
router ospf 1
router-id 255.255.255.1
!
Output:
R4(config-router)#do sh ip ospf data
OSPF Router with ID (100.1.4.4) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
100.1.1.1 100.1.1.1 1494 0x80000239 0x006F79 2
100.1.4.4 100.1.4.4 1406 0x80000235 0x00983F 2
255.255.255.1 255.255.255.1 1217 0x80000002 0x00D714 2
--
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Sr. Support Engineer – IPexpert, Inc.
URL: http://www.IPexpert.com
On Thu, Sep 17, 2009 at 10:54 PM, Joe Astorino <[email protected]>wrote:
> Indeed, indeed. The RID is just a 32-bit number, not an IP address. The
> RID could be the same 32-bit number as an IP address happens to be, but it
> is not the same thing. In other words, the RID does not have to be a
> reachable IP address
>
>
> On Thu, Sep 17, 2009 at 3:21 PM, Bryan Bartik <[email protected]>wrote:
>
>> Yep, exactly :-)
>>
>>
>> On Thu, Sep 17, 2009 at 12:39 PM, Kim Pedersen <[email protected]>wrote:
>>
>>> I dont see any reason why it wouldnt, it has the router-ID in its OSPF
>>> database, and then it should work automagically..
>>>
>>> Kim
>>>
>>> Syed Zaidi wrote:
>>> > Thats right it is just a 32 bit address to identify a router in OSPF..
>>> > but it is not an IP address. This way I was thinking whether
>>> > configuring this address as the virtual link peer of the other ABR
>>> > shall enable to bring the virtual link up?
>>> >
>>> >
>>> >
>>> > On Fri, Sep 18, 2009 at 12:02 AM, Kim Pedersen <[email protected]
>>> > <mailto:[email protected]>> wrote:
>>> >
>>> > Hi,
>>> >
>>> > As far as i know, its purely the router ID, which can be
>>> > represented as an IP address, but in fact its just a 32bit number.
>>> >
>>> > Kim
>>> >
>>> > Syed Zaidi wrote:
>>> >
>>> > Hello!
>>> >
>>> > This is about Vlinks in OSPF.
>>> >
>>> > While configuring OSPF VL, we configure it between to non
>>> > area0 ABRs, here I would like to know about this..--> when we
>>> > actually configure these VLinks we define other ABR's
>>> > Router-id on both the ABRs... well, what I want to know here
>>> > is; whether this router-id can be the 32 bit address but NOT
>>> > an actual interface IP address of any interfaces on both the
>>> > ABRs? I mean is this setup ok, will it still bring the VIRTUAL
>>> > LINK up?
>>> >
>>> > Waiting for a quick answer ASAP.
>>> >
>>> > Regards,
>>> > Syed
>>> >
>>> >
>>> ------------------------------------------------------------------------
>>> >
>>> > _______________________________________________
>>> > For more information regarding industry leading CCIE Lab
>>> > training, please visit www.ipexpert.com <
>>> http://www.ipexpert.com>
>>> >
>>> >
>>> >
>>> > --
>>> >
>>> > // Freedom Matters
>>> > // Follow my progress on: http://kpjungle.wordpress.com
>>> >
>>> >
>>>
>>> --
>>>
>>> // Freedom Matters
>>> // Follow my progress on: http://kpjungle.wordpress.com
>>>
>>> _______________________________________________
>>> For more information regarding industry leading CCIE Lab training, please
>>> visit www.ipexpert.com
>>>
>>
>>
>>
>> --
>> Bryan Bartik
>> CCIE #23707 (R&S), CCNP
>> Sr. Support Engineer - IPexpert, Inc.
>> URL: http://www.IPexpert.com
>>
>> _______________________________________________
>> For more information regarding industry leading CCIE Lab training, please
>> visit www.ipexpert.com
>>
>>
>
>
> --
> Regards,
>
> Joe Astorino - CCIE #24347 R&S
> Technical Instructor - IPexpert, Inc.
> Cell: +1.586.212.6107
> Fax: +1.810.454.0130
> Mailto: [email protected]
>
> _______________________________________________
> For more information regarding industry leading CCIE Lab training, please
> visit www.ipexpert.com
>
>
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
