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Why local learned ARP in EVPN has "permanent remote" flags
Hi! Experts

Sorry for disturbing, I am curious why local learned ARP in EVPN also has
"permanent remote" flags? if it is learned from remote VTEP then makes
sense, cause it is learned from BGP. but why local learned ARP also has
these flags.

lab@qfx5110> show arp no-resolve
MAC Address Address Interface Flags
fe:00:00:00:00:80 128.0.0.16 bme0.0 permanent
84:b5:9c:ce:b9:71 192.168.0.0 xe-0/0/46.0 none
b8:c2:53:ad:e1:03 192.168.1.1 em2.32768 none
7e:13:0b:56:e5:c0 192.168.1.16 em2.32768 none
5c:5e:ab:6b:d5:81 192.168.5.1 em0.0 none
64:87:88:b8:55:43 192.168.100.10 irb.100 [ae1.0] permanent remote

Thanks for your help.

--
BR!



James Chen
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Re: Why local learned ARP in EVPN has "permanent remote" flags [ In reply to ]
As I understand it, this is because ARP learning is handled by EVPN
(including aging) and not the normal ARP handling mechanism.

Marking it as permanent in the ARP table prevents race conditions between
EVPN and normal ARP processing. EVPN will delete the permanent entry when
the mac-ip entry ages out of the EVPN table (whether it was learned locally
or from a remote device).

--
Eldon

On Sun, Dec 13, 2020, 20:43 Chen Jiang <ilovebgp4@gmail.com> wrote:

> Hi! Experts
>
> Sorry for disturbing, I am curious why local learned ARP in EVPN also has
> "permanent remote" flags? if it is learned from remote VTEP then makes
> sense, cause it is learned from BGP. but why local learned ARP also has
> these flags.
>
> lab@qfx5110> show arp no-resolve
> MAC Address Address Interface Flags
> fe:00:00:00:00:80 128.0.0.16 bme0.0 permanent
> 84:b5:9c:ce:b9:71 192.168.0.0 xe-0/0/46.0 none
> b8:c2:53:ad:e1:03 192.168.1.1 em2.32768 none
> 7e:13:0b:56:e5:c0 192.168.1.16 em2.32768 none
> 5c:5e:ab:6b:d5:81 192.168.5.1 em0.0 none
> 64:87:88:b8:55:43 192.168.100.10 irb.100 [ae1.0] permanent remote
>
> Thanks for your help.
>
> --
> BR!
>
>
>
> James Chen
> _______________________________________________
> juniper-nsp mailing list juniper-nsp@puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp
>
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