[j-nsp] Clearing ARP on Logical Interface (M/MX Series)

[Felix SchŸueren]

toph,

> 
> Perhaps even a way to clear all the arp entries for a CIDR, as this
> would still speed the time instead of having to clear all the arp
> entries individually with "clear arp hostname x.x.x.x".
> 
> Does anyone have any insight?
> 

I've been bugging J about this for years. Even vendor F (nowadays vendor 
B) does it properly, where you can state interfaces or CIDR addresses to 
be cleared.

What junos needs and sorely lacks is
clear arp interface x/y/z
clear arp cidr a.b.c.d/m

and while we're at it:
clear ipv6 neighbor interface x/y/z
clear ipv6 neighbor cidr a::/m

right now, you basically have to write small shell scripts to copy-paste 
sequential "clear arp hostname x" statements, like so:

~ > for i in 1 2 3 4 5 6 7 8 9 10; do echo "clear arp hostname 
a.b.c.${i}"; done

clear arp hostname a.b.c.1
clear arp hostname a.b.c.2
clear arp hostname a.b.c.3
clear arp hostname a.b.c.4
clear arp hostname a.b.c.5
clear arp hostname a.b.c.6
clear arp hostname a.b.c.7
clear arp hostname a.b.c.8
clear arp hostname a.b.c.9
clear arp hostname a.b.c.10

That's just for CIDR though, if you want to clear a whole interface, 
it's even worse, beause you have to do the following:

show arp no-resolve | match x/y/z | save tempfile
(which takes ~5 seconds on an ethernet router with just ~20k ARP entries)
start shell
awk '{print "clear arp hostname " $2}' < tempfile

and then copy-paste hundreds or thousands of "clear arp" lines.

So please, bug your sales people about this.

Kind regards,

Felix

-- 
Felix Schüren
Head of Network

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