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
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