@node Handling SNMP Traps @section Handling SNMP Traps To handle snmp traps make sure your snmp setup of quagga works correctly as described in the quagga documentation in @xref{SNMP Support}. The BGP4 mib will send traps on peer up/down events. These should be visible in your snmp logs with a message similar to: @samp{snmpd[13733]: Got trap from peer on fd 14} To react on these traps they should be handled by a trapsink. Configure your trapsink by adding the following lines to @file{/etc/snmpd/snmpd.conf}: @example # send traps to the snmptrapd on localhost trapsink localhost @end example This will send all traps to an snmptrapd running on localhost. You can of course also use a dedicated management station to catch traps. Configure the snmptrapd daemon by adding the following line to @file{/etc/snmpd/snmptrapd.conf}: @example traphandle .1.3.6.1.4.1.3317.1.2.2 /etc/snmp/snmptrap_handle.sh @end example This will use the bash script @file{/etc/snmp/snmptrap_handle.sh} to handle the BGP4 traps. To add traps for other protocol daemons, lookup their appropriate OID from their mib. (For additional information about which traps are supported by your mib, lookup the mib on @uref{http://www.oidview.com/mibs/detail.html}). Make sure snmptrapd is started. The snmptrap_handle.sh script I personally use for handling BGP4 traps is below. You can of course do all sorts of things when handling traps, like sound a siren, have your display flash, etc., be creative ;). @verbatim #!/bin/bash # routers name ROUTER=`hostname -s` #email address use to sent out notification EMAILADDR="john@doe.com" #email address used (allongside above) where warnings should be sent EMAILADDR_WARN="sms-john@doe.com" # type of notification TYPE="Notice" # local snmp community for getting AS belonging to peer COMMUNITY="" # if a peer address is in $WARN_PEERS a warning should be sent WARN_PEERS="192.0.2.1" # get stdin INPUT=`cat -` # get some vars from stdin uptime=`echo $INPUT | cut -d' ' -f5` peer=`echo $INPUT | cut -d' ' -f8 | sed -e 's/SNMPv2-SMI::mib-2.15.3.1.14.//g'` peerstate=`echo $INPUT | cut -d' ' -f13` errorcode=`echo $INPUT | cut -d' ' -f9 | sed -e 's/\"//g'` suberrorcode=`echo $INPUT | cut -d' ' -f10 | sed -e 's/\"//g'` remoteas=`snmpget -v2c -c $COMMUNITY localhost SNMPv2-SMI::mib-2.15.3.1.9.$peer | cut -d' ' -f4` WHOISINFO=`whois -h whois.ripe.net " -r AS$remoteas" | egrep '(as-name|descr)'` asname=`echo "$WHOISINFO" | grep "^as-name:" | sed -e 's/^as-name://g' -e 's/ //g' -e 's/^ //g' | uniq` asdescr=`echo "$WHOISINFO" | grep "^descr:" | sed -e 's/^descr://g' -e 's/ //g' -e 's/^ //g' | uniq` # if peer address is in $WARN_PEER, the email should also # be sent to $EMAILADDR_WARN for ip in $WARN_PEERS; do if [ "x$ip" == "x$peer" ]; then EMAILADDR="$EMAILADDR,$EMAILADDR_WARN" TYPE="WARNING" break fi done # convert peer state case "$peerstate" in 1) peerstate="Idle" ;; 2) peerstate="Connect" ;; 3) peerstate="Active" ;; 4) peerstate="Opensent" ;; 5) peerstate="Openconfirm" ;; 6) peerstate="Established" ;; *) peerstate="Unknown" ;; esac # get textual messages for errors case "$errorcode" in 00) error="No error" suberror="" ;; 01) error="Message Header Error" case "$suberrorcode" in 01) suberror="Connection Not Synchronized" ;; 02) suberror="Bad Message Length" ;; 03) suberror="Bad Message Type" ;; *) suberror="Unknown" ;; esac ;; 02) error="OPEN Message Error" case "$suberrorcode" in 01) suberror="Unsupported Version Number" ;; 02) suberror="Bad Peer AS" ;; 03) suberror="Bad BGP Identifier" ;; 04) suberror="Unsupported Optional Parameter" ;; 05) suberror="Authentication Failure" ;; 06) suberror="Unacceptable Hold Time" ;; *) suberror="Unknown" ;; esac ;; 03) error="UPDATE Message Error" case "$suberrorcode" in 01) suberror="Malformed Attribute List" ;; 02) suberror="Unrecognized Well-known Attribute" ;; 03) suberror="Missing Well-known Attribute" ;; 04) suberror="Attribute Flags Error" ;; 05) suberror="Attribute Length Error" ;; 06) suberror="Invalid ORIGIN Attribute" ;; 07) suberror="AS Routing Loop" ;; 08) suberror="Invalid NEXT_HOP Attribute" ;; 09) suberror="Optional Attribute Error" ;; 10) suberror="Invalid Network Field" ;; 11) suberror="Malformed AS_PATH" ;; *) suberror="Unknown" ;; esac ;; 04) error="Hold Timer Expired" suberror="" ;; 05) error="Finite State Machine Error" suberror="" ;; 06) error="Cease" case "$suberrorcode" in 01) suberror="Maximum Number of Prefixes Reached" ;; 02) suberror="Administratively Shutdown" ;; 03) suberror="Peer Unconfigured" ;; 04) suberror="Administratively Reset" ;; 05) suberror="Connection Rejected" ;; 06) suberror="Other Configuration Change" ;; 07) suberror="Connection collision resolution" ;; 08) suberror="Out of Resource" ;; 09) suberror="MAX" ;; *) suberror="Unknown" ;; esac ;; *) error="Unknown" suberror="" ;; esac # create textual message from errorcodes if [ "x$suberror" == "x" ]; then NOTIFY="$errorcode ($error)" else NOTIFY="$errorcode/$suberrorcode ($error/$suberror)" fi # form a decent subject SUBJECT="$TYPE: $ROUTER [bgp] $peer is $peerstate: $NOTIFY" # create the email body MAIL=`cat << EOF BGP notification on router $ROUTER. Peer: $peer AS: $remoteas New state: $peerstate Notification: $NOTIFY Info: $asname $asdescr Snmpd uptime: $uptime EOF` # mail the notification echo "$MAIL" | mail -s "$SUBJECT" $EMAILADDR @end verbatim @comment contributed by unknown contributer, please contact maintainers @comment for credit / attribution.