Re: MPLS Label Advertisment and Split Horizon

Dear Syed,

MPLS primarily relay on IGP protocol for the loop prevention. If loop
occurs, the TTL value in the label header prevent the infinite
looping. (TTL Propogation helps in this case)

In Cell mode MPLS, LDP uses an additional TLV (type length value) to
count the number of hops in an LSP.

Regards
Anser

On Fri, Jan 29, 2010 at 7:04 PM, Bryan Bartik <bbartik_at_ipexpert.com> wrote:
> Syed,
>
> The IGP will (should) prevent loops. However, there are some mechanisms with
> cell mode LSRs. Although out of scope of the blueprint, I found this page:
>
> http://bit.ly/98m5x6
>
> -hth
>
> On Fri, Jan 29, 2010 at 7:01 AM, Syed Khalid Ali <
> khalid_khursheed_at_hotmail.com> wrote:
>
>> Group:
>> I am reading through the Cisco Press MPLS Fundamentals chapter 4. The label
>> advertisement section state that it does not follow the Split Horizon rule.
>> So
>> how does the Label Loops are avoided???
>> Another thing is that what topics or section to be completed with respect
>> to
>> R&S V4 blueprint.
>> ThanksKhalid
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>
>
> --
> Bryan Bartik
> CCIE #23707 (R&S, SP), CCNP
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>
>
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>
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Received on Fri Jan 29 2010 - 20:32:32 ART