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Re: [bess] EVPN VPWS BDF forwarding behavior at MH site

"Thirumavalavan Periyannan (thiperiy)" <thiperiy@cisco.com> Fri, 09 August 2019 21:20 UTC

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From: "Thirumavalavan Periyannan (thiperiy)" <thiperiy@cisco.com>
To: gangadhara reddy chavva <meetgangadhara@gmail.com>
CC: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] EVPN VPWS BDF forwarding behavior at MH site
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Date: Fri, 09 Aug 2019 21:20:34 +0000
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Subject: Re: [bess] EVPN VPWS BDF forwarding behavior at MH site
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Hello Gangadhara,

How remote PE detect the DF failure? It’s based on EVI/AD Withdraw message from DF PE if so then NDF PE also received this route and changed its DF status at the same time Remote PE changed its nexthop to NEW DF PE.

The below info is not clear, could you please help me to understand.

for faster convergence if we can install the route such that BDF can allow the traffic from remote PE towards to multi homed segment, we can forward the traffic received from the remote PE.

at the same time we shouldn't allow the traffic from multi homed site this leads to duplicate traffic on the remote PE. to achieve this we should not program the path from multi home site towards remote PE until this PE elected as DF for that VPWS instance.

Thanks,
Thiru

On 09-Aug-2019, at 19:02, gangadhara reddy chavva <meetgangadhara@gmail.com<mailto:meetgangadhara@gmail.com>> wrote:

HI All,

i have one question on EVPN VPWS BDF forwarding behavior at MH site.
when PE is selected as BDF, it will communicate the EAD EVI route with B bit set to remote PE. so remote PE will install the FRR route with primary path towards DF PE and secondary path towards BDF.
when ever primary path get disconnected it will switch the path to secondary path quickly at remote PE. because of this data from the remote PE will reach to BDF very quickly, but if BDF is not programmed its path towards multi homed segment then traffic will be get dropped until control plane convergence and it will be elected as DF.

for faster convergence if we can install the route such that BDF can allow the traffic from remote PE towards to multi homed segment, we can forward the traffic received from the remote PE.

at the same time we shouldn't allow the traffic from multi homed site this leads to duplicate traffic on the remote PE. to achieve this we should not program the path from multi home site towards remote PE until this PE elected as DF for that VPWS instance.

can you please let me know if there are any problems with this kind of approach..

<image.png>

Regards,
Gangadhar






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