Re: Link state protocol

Thanks joe :) got it now :)

On Thu, Sep 17, 2009 at 3:06 PM, Joe Astorino <jastorino_at_ipexpert.com>wrote:

> If the link is shut down you will not see it in the database...below you
> see that I shutdown the serial link on R2 and as a result 2 of the 3 LSAs
> went away (only the loopback remains)
>
> R2(config)#int s0/1/0
> R2(config-if)#shutdown
>
> R2(config-if)#do sh ip ospf data router
>
> OSPF Router with ID (2.2.2.2) (Process ID 1)
>
> Router Link States (Area 0)
>
> LS age: 10
> Options: (No TOS-capability, DC)
> LS Type: Router Links
> Link State ID: 2.2.2.2
> Advertising Router: 2.2.2.2
> LS Seq Number: 80000064
> Checksum: 0xDFD6
> Length: 36
> Number of Links: 1
>
> Link connected to: a Stub Network
> (Link ID) Network/subnet number: 2.2.2.2
> (Link Data) Network Mask: 255.255.255.255
> Number of TOS metrics: 0
> TOS 0 Metrics: 1
>
>
> On Thu, Sep 17, 2009 at 5:32 AM, jack daniels <jckdaniels12_at_gmail.com>wrote:
>
>> Hi,
>>
>> where is the state of the LINK ( up/down) in the output.
>>
>> Regards
>>
>> On Thu, Sep 17, 2009 at 3:00 PM, Joe Astorino <jastorino_at_ipexpert.com>wrote:
>>
>>> Check out the LSDB. Here is an example of a type-1 LSA stored in the
>>> link-state database on a router
>>>
>>> R2#sh ip ospf data router
>>>
>>> OSPF Router with ID (2.2.2.2) (Process ID 1)
>>>
>>> Router Link States (Area 0)
>>>
>>> LS age: 498
>>> Options: (No TOS-capability, DC)
>>> LS Type: Router Links
>>> Link State ID: 2.2.2.2
>>> Advertising Router: 2.2.2.2
>>> LS Seq Number: 80000063
>>> Checksum: 0x1569
>>> Length: 60
>>> Number of Links: 3
>>>
>>> Link connected to: a Stub Network
>>> (Link ID) Network/subnet number: 2.2.2.2
>>> (Link Data) Network Mask: 255.255.255.255
>>> Number of TOS metrics: 0
>>> TOS 0 Metrics: 1
>>>
>>> Link connected to: another Router (point-to-point)
>>> (Link ID) Neighboring Router ID: 6.6.6.6
>>> (Link Data) Router Interface address: 150.100.100.2
>>> Number of TOS metrics: 0
>>> TOS 0 Metrics: 64
>>>
>>> Link connected to: a Stub Network
>>> (Link ID) Network/subnet number: 150.100.100.2
>>> (Link Data) Network Mask: 255.255.255.255
>>> Number of TOS metrics: 0
>>> TOS 0 Metrics: 0
>>>
>>>
>>>
>>> On Thu, Sep 17, 2009 at 5:15 AM, jack daniels <jckdaniels12_at_gmail.com>wrote:
>>>
>>>> Hi,
>>>>
>>>> Thanks , but where can I see the output of Links State ( up/down ) in
>>>> OSPF
>>>> database or routing table .
>>>>
>>>> Regards
>>>>
>>>>
>>>>
>>>> On Thu, Sep 17, 2009 at 1:48 PM, Abraham, Tharak <
>>>> tharakabraham_at_gmail.com>wrote:
>>>>
>>>> > Flooding is the only method by which all the neighbors will have the
>>>> same
>>>> > database.
>>>> >
>>>> > One LSA is sent per each routers link with the details like
>>>> >
>>>> > 1. identifying the link --> network
>>>> > 2. state of the link ---> up/down
>>>> > 3. metric cost --> interface cost to the link
>>>> > 4. any other links attached to that link --> neighbors on that link
>>>> >
>>>> >
>>>> >
>>>> > Best Regards,
>>>> > Tharak Abraham Luke
>>>> > Sent from Netherlands
>>>> >
>>>> > On Thu, Sep 17, 2009 at 9:25 AM, jack daniels <
>>>> jckdaniels12_at_gmail.com>wrote:
>>>> >
>>>> >> Hi All,
>>>> >>
>>>> >> When we say Link state protocols flood link information to build to
>>>> >> complete
>>>> >> topology. >>>>
>>>> >> Please help me in understanding what does it mens flood link
>>>> >> information >>>>> as in OSPF or ISIS we see next hop cost .....but
>>>> where
>>>> >> is
>>>> >> link states . Does link state mean Link State ( physicall state
>>>> up/down)
>>>> >>
>>>> >> Regards
>>>> >>
>>>> >>
>>>> >> Blogs and organic groups at http://www.ccie.net
>>>> >>
>>>> >>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Regards,
>>>
>>> Joe Astorino - CCIE #24347 R&S
>>> Technical Instructor - IPexpert, Inc.
>>> Cell: +1.586.212.6107
>>> Fax: +1.810.454.0130
>>> Mailto: jastorino_at_ipexpert.com
>>>
>>
>>
>
>
> --
> Regards,
>
> Joe Astorino - CCIE #24347 R&S
> Technical Instructor - IPexpert, Inc.
> Cell: +1.586.212.6107
> Fax: +1.810.454.0130
> Mailto: jastorino_at_ipexpert.com

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Received on Thu Sep 17 2009 - 15:13:51 ART