Re: [bess] A question on CE behavior on traffic forwarding to EVPN multihomed PEs in single-active mode

2019-02-13 Thread Jaikumar Somasundaram 
Thanks Mrinmoy for the quick answer.

Thanks & Regards
Jaikumar S

From: Mrinmoy Ghosh (mrghosh) 
Sent: Wednesday, February 13, 2019 1:21 PM
To: Jaikumar Somasundaram ; bess@ietf.org
Cc: Pradeep Ramakrishnan ; Chalapathi Andhe 

Subject: RE: A question on CE behavior on traffic forwarding to EVPN multihomed 
PEs in single-active mode

Hi Jaikumar,

EVPN Single active heavily depends upon MAC Flush mechanism like MVRP or TCN 
Flush.

In your topology, initially CE1 would flood unknown ucast to both PE1 and PE2; 
PE1 being DF will send and receive traffic for that (ES, EVI), hence once the 
traffic  will be learned eventually from PE1.
However on switchover, Mac flush is sent to CE so that the forwarding table is 
flushed and the traffic is flooded to both PE until learned from the new DF.

Thanks,
Mrinmoy

From: BESS mailto:bess-boun...@ietf.org>> On Behalf Of 
Jaikumar Somasundaram
Sent: Tuesday, February 12, 2019 10:11 PM
To: bess@ietf.org
Cc: Pradeep Ramakrishnan 
mailto:pradeep.ramakrish...@ericsson.com>>; 
Chalapathi Andhe 
mailto:chalapathi.an...@ericsson.com>>
Subject: [bess] A question on CE behavior on traffic forwarding to EVPN 
multihomed PEs in single-active mode

Hello All,

In EVPN MH with Single-Active scenario, could you help us to clarify the below 
query?

 --
 ||
   PORT1 |  DEVICE1   |PORT3
   --| PE1|-
   |  1/5|  2.2.2.2   | 1/4 |
   | || |
   | -- |
   |PORT1  |PORT2   |PORT2
--| ++--
 ||| |||
|
 | DEVICE4|| ||PORT1   | DEVICE4
|
 | (CE1)  || |   DEVICE3  || (CE2)  
|
 | Multi-home || | PE |   PORT3| Single 
home|
 ||| |   4.4.4.4  ||
|
--| ++--
   |PORT2  |1/1|PORT3
   |   |PORT2  | 1/6
   | --|
   | |||
   |   PORT1 |  DEVICE2   ||
   --|PE2 |-
1/4  |  3.3.3.3   |PORT3
 ||1/4
 --

Let's say CE1 is connected to PE1 and PE2 (single-active case)
and PE1 is the DF for VLAN 10 and has the active link,
but CE1 sends unknown unicast traffic on the link to PE2 (standby link),
wouldn't the traffic be dropped because its non-DF ?

or

How does CE ensure traffic is always forwarded on the active link
(as standby link will drop the traffic) ?

Thanks & Regards
Jaikumar S

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Re: [bess] A question on CE behavior on traffic forwarding to EVPN multihomed PEs in single-active mode

2019-02-13 Thread Yu Tianpeng 
I guess it worth clarify CE using LAG or L2 switching to connect to PE in
the question.
Thanks
Tim


On Wed, 13 Feb 2019, 07:51 Mrinmoy Ghosh (mrghosh)  Hi Jaikumar,
>
>
>
> EVPN Single active heavily depends upon MAC Flush mechanism like MVRP or
> TCN Flush.
>
>
>
> In your topology, initially CE1 would flood unknown ucast to both PE1 and
> PE2; PE1 being DF will send and receive traffic for that (ES, EVI), hence
> once the traffic  will be learned eventually from PE1.
>
> However on switchover, Mac flush is sent to CE so that the forwarding
> table is flushed and the traffic is flooded to both PE until learned from
> the new DF.
>
>
>
> Thanks,
>
> Mrinmoy
>
>
>
> *From:* BESS  *On Behalf Of * Jaikumar Somasundaram
> *Sent:* Tuesday, February 12, 2019 10:11 PM
> *To:* bess@ietf.org
> *Cc:* Pradeep Ramakrishnan ;
> Chalapathi Andhe 
> *Subject:* [bess] A question on CE behavior on traffic forwarding to EVPN
> multihomed PEs in single-active mode
>
>
>
> Hello All,
>
>
>
> In EVPN MH with Single-Active scenario, could you help us to clarify the
> below query?
>
>
>
>  --
>
>  ||
>
>PORT1 |  DEVICE1   |PORT3
>
>--| PE1|-
>
>|  1/5|  2.2.2.2   | 1/4 |
>
>| || |
>
>| -- |
>
>|PORT1  |PORT2   |PORT2
>
> --| ++
> --
>
>  ||| ||
> ||
>
>  | DEVICE4|| ||PORT1   |
> DEVICE4|
>
>  | (CE1)  || |   DEVICE3  ||
> (CE2)  |
>
>  | Multi-home || | PE |   PORT3|
> Single home|
>
>  ||| |   4.4.4.4  |
> ||
>
> --| ++
> --
>
>|PORT2  |1/1|PORT3
>
>|   |PORT2  | 1/6
>
>| --|
>
>| |||
>
>|   PORT1 |  DEVICE2   ||
>
>--|PE2 |-
>
> 1/4  |  3.3.3.3   |PORT3
>
>  ||1/4
>
>  --
>
>
>
> Let’s say CE1 is connected to PE1 and PE2 (single-active case)
>
> and PE1 is the DF for VLAN 10 and has the active link,
>
> but CE1 sends unknown unicast traffic on the link to PE2 (standby link),
>
> wouldn’t the traffic be dropped because its non-DF ?
>
>
>
> or
>
>
>
> How does CE ensure traffic is always forwarded on the active link
>
> (as standby link will drop the traffic) ?
>
>
>
> Thanks & Regards
>
> Jaikumar S
>
>
> ___
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>
___
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Re: [bess] A question on CE behavior on traffic forwarding to EVPN multihomed PEs in single-active mode

2019-02-12 Thread Mrinmoy Ghosh (mrghosh) 
Hi Jaikumar,

EVPN Single active heavily depends upon MAC Flush mechanism like MVRP or TCN 
Flush.

In your topology, initially CE1 would flood unknown ucast to both PE1 and PE2; 
PE1 being DF will send and receive traffic for that (ES, EVI), hence once the 
traffic  will be learned eventually from PE1.
However on switchover, Mac flush is sent to CE so that the forwarding table is 
flushed and the traffic is flooded to both PE until learned from the new DF.

Thanks,
Mrinmoy

From: BESS  On Behalf Of Jaikumar Somasundaram
Sent: Tuesday, February 12, 2019 10:11 PM
To: bess@ietf.org
Cc: Pradeep Ramakrishnan ; Chalapathi Andhe 

Subject: [bess] A question on CE behavior on traffic forwarding to EVPN 
multihomed PEs in single-active mode

Hello All,

In EVPN MH with Single-Active scenario, could you help us to clarify the below 
query?

 --
 ||
   PORT1 |  DEVICE1   |PORT3
   --| PE1|-
   |  1/5|  2.2.2.2   | 1/4 |
   | || |
   | -- |
   |PORT1  |PORT2   |PORT2
--| ++--
 ||| |||
|
 | DEVICE4|| ||PORT1   | DEVICE4
|
 | (CE1)  || |   DEVICE3  || (CE2)  
|
 | Multi-home || | PE |   PORT3| Single 
home|
 ||| |   4.4.4.4  ||
|
--| ++--
   |PORT2  |1/1|PORT3
   |   |PORT2  | 1/6
   | --|
   | |||
   |   PORT1 |  DEVICE2   ||
   --|PE2 |-
1/4  |  3.3.3.3   |PORT3
 ||1/4
 --

Let's say CE1 is connected to PE1 and PE2 (single-active case)
and PE1 is the DF for VLAN 10 and has the active link,
but CE1 sends unknown unicast traffic on the link to PE2 (standby link),
wouldn't the traffic be dropped because its non-DF ?

or

How does CE ensure traffic is always forwarded on the active link
(as standby link will drop the traffic) ?

Thanks & Regards
Jaikumar S

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