Re: BFD ques

If not all devices support BFD, you can alternately (or preferred?)
selected "ip ospf dead-interval minimal hello-multiplier (#)" as option
as well.

The maximum value for the hello multiplier (how many hellos within
1-second dead time) is 20. So you can get 50ms hellos. BFD operates
with this as a minimum timer as well!

There's a decent article on NiL's web site about BFD (they're a Cisco
Learning Partner from Slovenia as I recall):
http://www.nil.si/ipcorner/bfd/

HTH,

*Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713,

JNCIE-M #153, JNCIS-ER, CISSP, et al.

JNCI-M, JNCI-ER

evil_at_ine.com

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Victor Cappuccio wrote:
> Hi,
>
> Bi-directional Forwarding Detection (BFD) provides rapid failure detection
> times between forwarding engines, while maintaining low overhead. It also
> provides a single, standardized method.
>
> There are two different methods to inform OSPF that it should use BFD for
> failure detection. BFD can be enabled at the router if all OSPF neighbors
> have implemented BFD.
>
> router ospf 999
> bfd all-interfaces
> !
> Or you can also enable or disable BFD on a per-interface basis:
>
> interface fastEthernet 1/1/1
> [no] ip ospf bfd [disable]
>
>
> BFD is not tied to any particular routing protocol, it can be used as
> failure detection mechanism for OSPF, IS-IS, EIGRP, BGP and so on. Some
> parts of BFD can be distributed to the data plane, it can be less CPU
> intensive than Fast HELLOs, which exist wholly at the control plane. Fast
> HELLOs have an absolute minimum detection timer of one second; BFD can
> provide sub-second failure detection.
>
> Thanks,
>
> Victor Cappuccio.-
> vcappucc_at_cisco.com
> CCIE(R/S) #20657
> STAC Support Engineer
> Cisco Small Business Support.
> Telefono 900 900 089
>
>
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Abdullahi Bege Abubakar
> Sent: viernes, 03 de julio de 2009 13:16
> To: Thomas Perrier
> Cc: Cisco certification
> Subject: Re: BFD ques
>
> hi guys, i have read through the cod cd but need more light about what the*
> ip ospf bfd* accomplish.
>
> Abdullahi Bege A.
> CCNA CCNP CCIE Wirtten
> Network Engineer
> Microaccess solution Ltd,
> Cisco Silver Partner Certified
> www.microaccess.com
> On Thu, Jul 2, 2009 at 2:01 PM, Thomas Perrier <thomas_at_perrier.name> wrote:
>
>
>> On Thu, Jul 2, 2009 at 2:34 PM, GAURAV MADAN<gauravmadan1177_at_gmail.com>
>> wrote:
>>
>>
>>> My software version is c3825-ipbase-mz.124-24.6.T5
>>>
>>> CCIE
>>>
>> It's somewhat painful that a CCIE wouldn't know that many features
>> aren't supported in IP Base IOS versions. Back to operationnal basics,
>> man! ;)
>>
>> -Thomas
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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>
>
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>
> _______________________________________________________________________
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>
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>
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Received on Fri Jul 03 2009 - 07:23:29 ART