RE: EEM to keep BGP peer shut during an interface flap

I have never seen an ISP that will run BFD with any customers... they seem to have enough issues just getting basic bgp setup (cogent anyone?)

How about an EEM solution that shuts down bgp for a few hours and turns it back on aftermarket hours? Yes it works... we use it :)

kbro-voip-rt01#show run | sec event

event manager directory user policy "flash:/"
event manager policy sendmail.tcl

event manager applet ShutdownCohereBGPNeighbor
 event track 10 state down
 action 1.0 info type routername
 action 2.0 cli command "enable"
 action 2.1 cli command "configure terminal"
 action 2.5 cli command "router bgp 65080"
 action 2.6 cli command "neighbor 208.71.93.213 shutdown"
 action 3.0 mail server "outbounds9.obsmtp.com" to "kbro-notif_at_affirmedsystems.com" from "kbro-voip-rt01_at_kbro.com" subject "Cohere VoIP Direct route down @ $_info_routername"

event manager applet EnableCohereat8PM
 event timer cron name EnableCohereat8PM cron-entry "0 20 * * *"
 action 1.0 info type routername
 action 2.0 cli command "enable"
 action 2.1 cli command "configure terminal"
 action 2.5 cli command "router bgp 65080"
 action 2.6 cli command "no neighbor 208.71.93.213 shutdown"

event manager applet NoShutCohere805PM
 event tag 1.0 track 10 state up
 event tag 2.0 timer cron name NoShutCohere805PM cron-entry "5 20 * * *"
 trigger occurs 1 delay 10
 correlate event 1.0 and event 2.0
 attribute tag 1.0 occurs 1
 attribute tag 2.0 occurs 1
 action 1.0 info type routername
 action 2.0 cli command "enable"
 action 2.1 cli command "configure terminal"
 action 2.5 cli command "router bgp 65080"
 action 2.6 cli command "no neighbor 208.71.93.213 shutdown"
 action 2.7 cli command "do clear ip nat translation *"
 action 3.0 mail server "outbounds9.obsmtp.com" to "kbro-notif_at_affirmedsystems.com" from "kbro-voip-rt01_at_kbro.com" subject "Cohere VoIP Direct route restored @ $_info_routername"

event manager applet EnableCohereat7AM
 event timer cron name EnableCohereat7AM cron-entry "0 7 * * *"
 action 1.0 info type routername
 action 2.0 cli command "enable"
 action 2.1 cli command "configure terminal"
 action 2.5 cli command "router bgp 65080"
 action 2.6 cli command "no neighbor 208.71.93.213 shutdown"

event manager applet KeepNoShutCohere705AM
 event tag 1.0 track 10 state up
 event tag 2.0 timer cron name KeepNoShutCohere705AM cron-entry "5 7 * * *"
 trigger occurs 1 delay 10
 correlate event 1.0 and event 2.0
 attribute tag 1.0 occurs 1
 attribute tag 2.0 occurs 1
 action 1.0 info type routername
 action 2.0 cli command "enable"
 action 2.1 cli command "configure terminal"
 action 2.5 cli command "router bgp 65080"
 action 2.6 cli command "no neighbor 208.71.93.213 shutdown"
 action 2.7 cli command "do clear ip nat translation *"
 action 3.0 mail server "outbounds9.obsmtp.com" to "kbro-notif_at_affirmedsystems.com" from "kbro-voip-rt01_at_kbro.com" subject "Cohere VoIP Direct route restored @ $_info_routername"

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of John Neiberger
Sent: Tuesday, August 13, 2013 12:12 PM
To: Chris Rae
Cc: Mathew; Cisco certification
Subject: Re: EEM to keep BGP peer shut during an interface flap

This. Exactly. Use BFD for this. It already does what you're trying to do and it's a heck of a lot easier to configure.

On Tue, Aug 13, 2013 at 6:53 AM, Chris Rae <chris.rae07_at_me.com> wrote:

> Hey Matt,
>
> Why not just use BFD?
> If the BFD peer is down (ie no keep alive or interface goes down) BGP
> will immediately reroute via other peer.
>
> Chris
>
> On 13/08/2013, at 7:52 PM, Mathew <mathewfer_at_gmail.com> wrote:
>
> > Hi,
> >
> > I tested two EEM applet configs:
> >
> > - One check for syslog for an interface down and CLI to shut down
> > BGP
> peer.
> > - Second one to no shut the BGP peer when syslog entry is seen with
> > interface up.
> >
> > In fact the interface that I want check is NOT being used for this
> > BGP peering so there is no way to do it with BGP configuration.
> >
> > The above two EEM configs works but the issue is that when this
> > interface start to flap, EEM keep shutting and no-shutting BGP peer.
> > I want to
> avoid
> > this as it results in BGP flap.
> >
> > Has any body tried an EEM solution to keep the BGP peer shut during
> > an interface flap?
> >
> > I do not mind keeping the BGP shut till interface flapping is over
> > but
> how
> > do we do/detect it with EEM?
> >
> > Thanks in advance for your replies.
> >
> > Mathew
> >
> >
> > --
> > Thanks
> >
> > Mathew
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
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Received on Wed Aug 14 2013 - 08:26:26 ART