Contents

Introduction

Problem

Solution

Introduction

This document describes the Border Gateway Protocol (BGP) routing table needs to monitor at regular interval for many of the customers for tracking reachability networks via network monitoring tool. It also explains how to collect BGP statistics via Simple Network Management Protocol (SNMP) with respect to the Virtual Routing and Forwarding (VRF) route table on the Aggregation Services Router (ASR) and Integrated Service Router (ISR) platform.

Problem

How to monitor BGP neighbours with the use of BGP4-MIB under VRF on ASR and ISR with the use of SNMP v3.

Note: BGP4-MIB is a context-aware MIB. This document is limited to the configuration on ASR and ISR platforms.

Solution

Use snmp context. SNMP context needs to be mapped to the SNMP group and the VRF which has those BGP neighbours.

Create new context mapping under VRF configuration:

#context <context_name>

SNMP  context enabling  configuration:

#snmp-server context <context_name>

Apply snmp context mapping to snmp group configuration

#snmp-server group <group_name> v3 <privacy_and_authentication_type> context <context_name>

Note: Depending on your release, the context command may get replace by snmp context command. See the CIsco IOS Network Managemnet  Command Refrence for more information

Configuration example:

Configure context bgp under vrf

R1(config)#ip vrf test

R1(config)#context bgp

Associate context bgp to snmp configuration and apply on snmp-server group configuration

R1(config)#do show run | sec snmp

snmp-server group testgroup v3 priv context bgp

snmp-server context bgp

R1(config)#do show snmp user

User name: testuser

Engine ID: 800000090300002CC8818300

storage-type: nonvolatile        active

Authentication Protocol: MD5

Privacy Protocol: AES128

Group-name: testgroup

Test VRF which contains the BGP neighbours:

R1#sh ip bgp vpnv4 vrf test summary

BGP router identifier 1.1.1.1, local AS number 1

BGP table version is 1, main routing table version 1

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd

10.1.1.2        4            2       0       0        1    0    0 never    Idle

Polling result with the use of the context (use the “-n” attribute to add the context when you poll):

ade # snmpwalk -v3 -u testuser -l authPriv -n bgp -a md5 -A BGL@dmin1 -x aes -X BGL@dmin1 10.201.168.29  1.3.6.1.2.1.15

SNMPv2-SMI::mib-2.15.1.0 = Hex-STRING: 10

SNMPv2-SMI::mib-2.15.2.0 = INTEGER: 1

SNMPv2-SMI::mib-2.15.3.1.1.10.1.1.2 = IpAddress: 0.0.0.0

SNMPv2-SMI::mib-2.15.3.1.2.10.1.1.2 = INTEGER: 1

SNMPv2-SMI::mib-2.15.3.1.3.10.1.1.2 = INTEGER: 2

SNMPv2-SMI::mib-2.15.3.1.4.10.1.1.2 = INTEGER: 4

SNMPv2-SMI::mib-2.15.3.1.5.10.1.1.2 = IpAddress: 0.0.0.0

SNMPv2-SMI::mib-2.15.3.1.6.10.1.1.2 = INTEGER: 0

SNMPv2-SMI::mib-2.15.3.1.7.10.1.1.2 = IpAddress: 10.1.1.2

SNMPv2-SMI::mib-2.15.3.1.8.10.1.1.2 = INTEGER: 0

SNMPv2-SMI::mib-2.15.3.1.9.10.1.1.2 = INTEGER: 2

SNMPv2-SMI::mib-2.15.3.1.10.10.1.1.2 = Counter32: 0

SNMPv2-SMI::mib-2.15.3.1.11.10.1.1.2 = Counter32: 0

SNMPv2-SMI::mib-2.15.3.1.12.10.1.1.2 = Counter32: 0

SNMPv2-SMI::mib-2.15.3.1.13.10.1.1.2 = Counter32: 0