BgpSessionMonitor

This monitor checks if a BGP session to a peering partner (peer-ip) is functional. The monitor uses the RFC1269 SNMP MIB to monitor the BGP-Session, and uses the following OIDs to test the session status:

BGP_PEER_STATE_OID = .1.3.6.1.2.1.15.3.1.2.<peer-ip>
BGP_PEER_ADMIN_STATE_OID = .1.3.6.1.2.1.15.3.1.3.<peer-ip>
BGP_PEER_REMOTEAS_OID = .1.3.6.1.2.1.15.3.1.9.<peer-ip>
BGP_PEER_LAST_ERROR_OID = .1.3.6.1.2.1.15.3.1.14.<peer-ip>
BGP_PEER_FSM_EST_TIME_OID = .1.3.6.1.2.1.15.3.1.16.<peer-ip>

The <peer-ip> is the far end IP address of the BGP session end point.

An SNMP GET request for BGP_PEER_STATE_OID returns a result between 1 and 6. The service states for Meridian are mapped as follows:

Result State description Monitor state in Meridian

1

Idle

DOWN

2

Connect

DOWN

3

Active

DOWN

4

OpenSent

DOWN

5

OpenConfirm

DOWN

6

Established

UP

Monitor facts

Class Name

org.opennms.netmgt.poller.monitors.BgpSessionMonitor

Remote Enabled

false

See RFC1771 BGP Finite State Machine for more information on how we defined the mapping.

Configuration and use

Table 1. Required monitor-specific parameter for the BgpSessionMonitor
Parameter Description Default

bgpPeerIp

IP address of the far end BGP peer session

n/a

This monitor implements the Common Configuration Parameters.

Examples

To monitor the session state Established, add a service to your poller configuration in ${OPENNMS_HOME}/etc/poller-configuration.xml. For example:

<!-- Example configuration poller-configuration.xml -->
<service name="BGP-Peer-99.99.99.99-AS65423" interval="300000"
         user-defined="false" status="on">
    <parameter key="retry" value="2" />
    <parameter key="timeout" value="3000" />
    <parameter key="port" value="161" />
    <parameter key="bgpPeerIp" value="99.99.99.99" />
</service>

<monitor service="BGP-Peer-99.99.99.99-AS65423" class-name="org.opennms.netmgt.poller.monitors.BgpSessionMonitor" />

Error code mapping

The BGP_PEER_LAST_ERROR_OID gives an error in hex code. The error codes returned are listed in the table below.

Error code Error Message

0100

Message Header Error

0101

Message Header Error - Connection Not Synchronized

0102

Message Header Error - Bad Message Length

0103

Message Header Error - Bad Message Type

0200

OPEN Message Error

0201

OPEN Message Error - Unsupported Version Number

0202

OPEN Message Error - Bad Peer AS

0203

OPEN Message Error - Bad BGP Identifier

0204

OPEN Message Error - Unsupported Optional Parameter

0205

OPEN Message Error (deprecated)

0206

OPEN Message Error - Unacceptable Hold Time

0300

UPDATE Message Error

0301

UPDATE Message Error - Malformed Attribute List

0302

UPDATE Message Error - Unrecognized Well-known Attribute

0303

UPDATE Message Error - Missing Well-known Attribute

0304

UPDATE Message Error - Attribute Flags Error

0305

UPDATE Message Error - Attribute Length Error

0306

UPDATE Message Error - Invalid ORIGIN Attribute

0307

UPDATE Message Error (deprecated)

0308

UPDATE Message Error - Invalid NEXT_HOP Attribute

0309

UPDATE Message Error - Optional Attribute Error

030A

UPDATE Message Error - Invalid Network Field

030B

UPDATE Message Error - Malformed AS_PATH

0400

Hold Timer Expired

0500

Finite State Machine Error

0600

Cease

0601

Cease - Maximum Number of Prefixes Reached

0602

Cease - Administrative Shutdown

0603

Cease - Peer De-configured

0604

Cease - Administrative Reset

0605

Cease - Connection Rejected

0606

Cease - Other Configuration Change

0607

Cease - Connection Collision Resolution

0608

Cease - Out of Resources

The error message text will be displayed in the service down log message. The log message also provides the following additional information:

BGP-Peer Adminstate
BGP-Peer Remote AS
BGP-Peer established time in seconds

Debugging

If you cannot detect or monitor the BGP session, use the following command to check that the device is providing BGP data via SNMP.

snmpwalk -v 2c -c <myCommunity> <myRouter2Monitor> .1.3.6.1.2.1.15.3.1.2.99.99.99.99

Replace 99.99.99.99 with your BGP-Peer IP. The result should be an integer between 1 and 6.