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Re: [Idr] BGP Auto discovery - L2 liveliness??

"Rajiv Asati (rajiva)" <rajiva@cisco.com> Fri, 20 July 2018 18:07 UTC

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From: "Rajiv Asati (rajiva)" <rajiva@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
CC: "idr@ietf.org" <idr@ietf.org>, Randy Bush <randy@psg.com>
Thread-Topic: BGP Auto discovery - L2 liveliness??
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Date: Fri, 20 Jul 2018 18:07:03 +0000
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References: <E461FEB2-11DF-4256-B701-5CD854C5378B@cisco.com>, <FB71D237-679F-4688-BD45-8B2349E2CC05@cisco.com>
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Subject: Re: [Idr] BGP Auto discovery - L2 liveliness??
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Hi Acee,

Yes, indeed. 

Cheers,
Rajiv Asati
Distinguished Engineer, Cisco Services


> On Jul 20, 2018, at 1:02 PM, Acee Lindem (acee) <acee@cisco.com> wrote:
> 
> Hi Rajiv, 
> This function is described in section 6 of https://www.ietf.org/id/draft-ymbk-lsvr-lsoe-01.txt. I guess you are questioned whether it should be a requirement of this mechanism. 
> 
> Thanks,
> Acee 
> 
> On 7/20/18, 11:43 AM, "Rajiv Asati (rajiva)" <rajiva@cisco.com> wrote:
> 
> 
>    Could someone please explain - How is L2 liveliness important for auto-discovery between 2 directly connected BGP neighbors (referring to the topology shown yesterday)? Or is it really meant to benefit the peering relationship (once established) - bring down the peer if L2 fails or vice versa?
> 
>    Or is it meant to benefit the (tenant/services) traffic (past bgp NLRI exchange) ? Likely not, since  (tenant/services) traffic may be L3 (or MPLS), and L2 liveliness would not be sufficient (after all, L2 can be working, while L3 might not or MPLS might not). 
> 
>    Cheers,
>    Rajiv  
> 
> 
>

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