[j-nsp] Event script to advertise DHCP issued IP in LLDP?

[Vincent Bernat]

 ❦  8 avril 2019 18:25 -07, Matt Peterson <matt at peterson.org>:

> In our environment we're using EX2300-C's as 10Gbps NID's for metro
> ethernet use *(meaning they're essentially a managed L2 switch with an
> in-band management IP). *These are configured without an IP address on the
> physical me0 interface, but instead receive an IP via DHCPv4 & v6 as a
> tagged "irb" VLAN interface *(note the dhcp retransmission-attempt,
> -interval, and force-discover options are crucial here - otherwise the unit
> will timeout all DHCP attempts prior to the interface having link up..).*
>
> We're trying to figure out an approach to define the "protocols lldp
> management-address" stanza with the current issued IP address.
> Unfortunately this command only accepts a static defined IP address, not an
> interface name. Upon looking at the possible events for a SLAX or Python
> script, only DHCP serving events exist - not DHCP client *(based off "help
> syslog" listing). *This is probably a feature request, but maybe another
> creative solution is possible? Thanks.

You may run your script on PFE_FW_SYSLOG_IP if you set the appropriate
firewall rule to match on DHCP answer. Your script will be executed
twice as this is not possible to make a difference between a DHCPOFFER
and a DHCPACK just with a family inet filter.
-- 
Let the data structure the program.
            - The Elements of Programming Style (Kernighan & Plauger)