Cisco Cisco IOS Software Release 12.2(14)S

The MPLS VPN MIB agent requires the following:

SNMP is installed and enabled on the label switching routers.

MPLS is enabled on the label switching routers.

Multiprotocol Border Gateway Protocol (BGP) is enabled on the label switching routers.

Cisco Express Forwarding is enabled on the label switching routers.

The following restrictions apply to the PPVPN-MPLS-VPN MIB for this release:

Configuration of the MIB using the SNMP SET command is not supported in this release, except 
for trap-related objects, such as mplsVpnNotificationEnable and 
mplsVpnVrfSecIllegalLabelRcvThresh.

The mplsVpnVrfBgpNbrPrefixTable is not supported in this version.

SNMP agent code operating in conjunction with the PPVPN-MPLS-VPN MIB enables a standardized, 
SNMP-based approach to managing MPLS VPNs in Cisco IOS. 

The PPVPN-MPLS-VPN MIB is based on the IETF draft MIB specification 
draft-ietf-ppvpn-mpls-vpn-mib-03.txt, which includes objects describing features that support MPLS 
VPN events. This IETF draft MIB, which undergoes revisions from time to time, is being evolved toward 
becoming a standard. Accordingly, the Cisco implementation of the PPVPN-MPLS-VPN MIB is 
expected to track the evolution of the IETF draft MIB, and may change accordingly.

Some slight differences between the IETF draft MIB and the actual implementation of MPLS VPNs 
within Cisco IOS require some minor translations between the PPVPN-MPLS-VPN MIB and the 
internal data structures of Cisco IOS. These translations are accomplished by means of the SNMP agent 
code. Also, while running as a low priority process, the SNMP agent provides a management interface 
to Cisco IOS. SNMP adds little overhead on the normal functions of the device.