New to EEM, i wanna soft reset BGP when a prefix list is applied

Istvan kelemen · ‎01-10-2015

Hello,

This is my script:

event manager applet SOFTRESETBGP_IN
event cli pattern "neighbor 10.0.0.2 prefix-list.* in" sync no skip no period 1
action 1.0 cli command "do clear ip bgp 10.0.0.2 soft in"
action 2.0 syslog msg "BGP PEERS SOFT RESETED IN"

event manager applet SOFTRESETBGP_OUT
event cli pattern "neighbor 10.0.0.2 prefix-list.* out" sync no skip no period 1
action 1.0 cli command "do clear ip bgp 10.0.0.2 soft out"
action 2.0 syslog msg "BGP PEERS SOFT RESETED OUT"

When I issue the "neighbor 10.0.0.2 prefix-list A in" command it displays the pre-defined syslog msg, but the peer is not reseted.

Test:

R1(config-router)#do sh ip bgp
BGP table version is 7, local router ID is 10.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*>i 2.2.2.2/32 10.0.0.2 0 100 0 i
*>i 22.22.22.22/32 10.0.0.2 0 100 0 i
R1(config-router)#neighbor 10.0.0.2 prefix-list A in
R1(config-router)#
*Jan 10 13:58:57.663: %HA_EM-6-LOG: SOFTRESETBGP_IN: BGP PEERS SOFT RESETED IN
R1(config-router)#do sh ip bgp
BGP table version is 7, local router ID is 10.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*>i 2.2.2.2/32 10.0.0.2 0 100 0 i
*>i 22.22.22.22/32 10.0.0.2 0 100 0 i
R1(config-router)#

When I do manually clear the peer, the policy applies:

R1(config)#do clear ip bgp 10.0.0.2 soft in
R1(config)#do sh ip bgp
BGP table version is 8, local router ID is 10.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*>i 2.2.2.2/32 10.0.0.2 0 100 0 i

I have also tried to clear both direction without ".*"

event manager applet SOFTRESETBGP
event cli pattern "neighbor 10.0.0.2 prefix-list" sync no skip no period 1
action 1.0 cli command "do clear ip bgp 10.0.0.2 soft"
action 2.0 syslog msg "BGP PEERS SOFT RESETED"

result is the same...

Istvan kelemen · ‎01-10-2015

Solved, debug shown "enable" is needed at the 1st place

Joe Clarke · ‎01-10-2015

Yep, and the "do" is not needed. You're not in config mode at this point.

Cisco Freak · ‎01-13-2015

Hi Joeseph,

event cli pattern "neighbor 10.0.0.2 prefix-list.* in" sync no skip no period 1

I am also new to EEM. Can you please tell me what is the importance of sync and no skip and no period 1 keyword in this script?

CF

Istvan kelemen · ‎01-13-2015

skip no means: execute the command (you can skip it)

sync no means: you have to execute the CLI command, then the EEM script runs

example to skip:

R1#sh running | b event
event manager applet OSPF
event cli pattern "clear ip ospf process" sync no skip yes period 1
!
end

R1#clear ip ospf process
R1#

without "skip"

R1#sh running | b event
R1#clear ip ospf process
Reset ALL OSPF processes? [no]: y
R1#

Joe Clarke · ‎01-15-2015

Istvan's explanation is correct. In addition, the "period 1" statement is kind of useless here. If you wanted to count the number of times the command executed in a given time window (or period), then you'd also have to add "occurs X".

In your case, I think you want the applet to run at the moment the command is executed. So I would just drop the period keyword.