From: shiran guez (shiranp3@gmail.com)
Date: Thu Oct 04 2007 - 16:35:12 ART
the next-hop-self is used with iBGP peering when you for example have
BB1 AS1
|
R2--R3 >> AS2
if for example BB2 will send his prefix update down to R3 and R3 will send
the prefix to his iBGP neighbor then the next hop you will see on R2 sh ip
bgp will be BB1 address as iBGP doesn't modify the next-hop value. so if you
do not have a route to get to BB1 then your prefix's will never be
considered as best and there for will never be in your route table.
to fix that issue you can do a next-hop-self on R3 peering statement to R2
and then R3 will modify the next-hop address to him self before he send out
the prefix's
you can see this explanation also under the command reference of the Doc Cd
On 10/4/07, Cecil Wilson <Cecil.Wilson@flextronics.com> wrote:
>
> Hello GS
> Can explain the next hop self command in BGP? Or any links that has
> a good explanation of the command?
>
> Thanks
>
>
> Cecil G. Wilson
> IT Network Services
> Office: (901) 215-2710
> Cell: (901) 601-6201
> VoIP 104-2710
> FLEX Logistics
> cecil.wilson@flextronics.com
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Joseph Brunner
> Sent: Friday, August 24, 2007 7:02 PM
> To: ccielab@groupstudy.com
> Subject: what is in there...(ETHERTYPES)
>
> "only what you take with you"
>
>
>
> Rack13R4(config)#access-list 101 permit ip any any precedence ?
>
> <0-7> Precedence value
>
> critical Match packets with critical precedence (5)
>
> flash Match packets with flash precedence (3)
>
> flash-override Match packets with flash override precedence (4)
>
> immediate Match packets with immediate precedence (2)
>
> internet Match packets with internetwork control precedence (6)
>
> network Match packets with network control precedence (7)
>
> priority Match packets with priority precedence (1)
>
> routine Match packets with routine precedence (0)
>
>
>
>
>
> While this works great to remember IP PREC number to name (for those
> annoying wred configs) can anyone give me a similar helpful way to find
> out the ethertype of IP, ARP, PVST+, etc. from either capture/deny of
> traffic on a router/switch, etc.
>
>
>
> Thanks,
>
>
>
> Joe
>
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-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
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