nanog mailing list archives
Re: Is there any data on packet duplication?
From: Saku Ytti <saku () ytti fi>
Date: Tue, 23 Jun 2020 10:03:00 +0300
On Tue, 23 Jun 2020 at 09:54, William Herrin <bill () herrin us> wrote:
There's a link in the chain you haven't explained. The packet which entered at S3 has a unicast destination MAC address. That's what was in the arp table. If they're following the standards, only one of PE1 and PE2 will accept packets with that destination mac address. The other, recognizing that the packet is not addressed to it, drops it.
There are many reasons why practical devices (such as VXR) don't use MAC HW filters. Such as your PHY runs out of HW filter slots, or the HW does not support per-vlan HW filter, or there is 1 subinterface with EoMPLS configured or other type of L2 service, requiring reception of any DMAC. There are also many reasons why both routers have the DMAC in their HW filter, such as VRRP, HSRP.
for example. But then this ring configuration doesn't exist in an AWS VPC and I've not particularly observed a lot of packet duplication out of Amazon.
Amazon does nothing standard, it's all AMZN. Hope this helps! -- ++ytti
Current thread:
- Re: Is there any data on packet duplication?, (continued)
- Re: Is there any data on packet duplication? Mark Tinka (Jun 22)
- Re: Is there any data on packet duplication? Saku Ytti (Jun 22)
- Re: Is there any data on packet duplication? Mark Tinka (Jun 22)
- Re: Is there any data on packet duplication? Saku Ytti (Jun 22)
- Re: Is there any data on packet duplication? Mark Tinka (Jun 22)
- Re: Is there any data on packet duplication? Sabri Berisha (Jun 22)
- Re: Is there any data on packet duplication? Saku Ytti (Jun 22)
- Re: Is there any data on packet duplication? Sabri Berisha (Jun 22)
- Re: Is there any data on packet duplication? Saku Ytti (Jun 22)
- Re: Is there any data on packet duplication? William Herrin (Jun 22)
- Re: Is there any data on packet duplication? Saku Ytti (Jun 23)
- Re: Is there any data on packet duplication? Karsten Thomann via NANOG (Jun 23)
- Re: Is there any data on packet duplication? Hal Murray via NANOG (Jun 23)