[FROG] Why two duplicate route-map exist in bgpd and zebra ?

21 Apr 2020

      Hi all,

I'm using quagga-0.99, I set a route-map by vtysh like this:

vtysh# prefix-list ARP2HOST_PL3 ...
...
vtysh# route-map ARP2HOST_RM2 deny sequence 6
vtysh#   match interface lo
vtysh# route-map ARP2HOST_RM2, permit, sequence 10
vtysh#   match ip address prefix-list ARP2HOST_PL3
But I found there are two SAME route-map exist in zebra and bgpd, like this:

vtysh# show route-map
...
ZEBRA:
route-map ARP2HOST_RM2, deny, sequence 6
Match clauses:
interface eth0
Set clauses:
Call clause:
Action:
Exit routemap
route-map ARP2HOST_RM2, permit, sequence 10
Match clauses:
ip address prefix-list ARP2HOST_PL3
Set clauses:
Call clause:
Action:
Exit routemap
BGP:
route-map ARP2HOST_RM2, deny, sequence 6
Match clauses:
Set clauses:
Call clause:
Action:
Exit routemap
route-map ARP2HOST_RM2, permit, sequence 10
Match clauses:
ip address prefix-list ARP2HOST_PL3
Set clauses:
metric 13
community 0:100
Call clause:
Action:
Exit routemap
And when I use command
...
vtysh# redistribute static route-map ARP2HOST_RM2
the redistribute will NOT process any static route SOMETIME, not always !!!

Then I compare by add route-map through zebra.conf and bgpd.conf, like
this:
...
zebra.conf:
route-map ARP2HOST_RM2 deny sequence 6
  match interface lo

...
bgpd.conf:
prefix-list ARP2HOST_PL3 ...
route-map ARP2HOST_RM2, permit, sequence 10
  match ip address prefix-list ARP2HOST_PL3
And show route-map result beome:
...
vtysh# show route-map
ZEBRA:
route-map ARP2HOST_RM2, deny, sequence 6
Match clauses:
interface eth0
Set clauses:
Call clause:
Action:
Exit routemap
BGP:
route-map ARP2HOST_RM2, permit, sequence 10
Match clauses:
ip address prefix-list ARP2HOST_PL3
Set clauses:
metric 13
community 0:100
Call clause:
Action:
Exit routemap
Then the redistribute will work.

focus on code, I guess ALL of zebra(zebra_routemap.c) and
bgpd(bgp_routemap.c) will process route-map from vtysh command, which cause
this bug?

If it is, how to set route-map correctly by vtysh?

Thanks !!!

----
Simon Jones