Cisco Cisco IOS Software Release 12.0(23)S
SNMP Notification Support for VPNs
Feature Overview
2
Cisco IOS Release: Multiple releases (see the Feature History table)
Feature Overview
The SNMP Notification Support for VPNs feature allows the sending and receiving of SNMP
notifications (traps and informs) using VPN routing/forwarding (VRFs) tables. In particular, this feature
adds support to Cisco IOS software for the sending and receiving of SNMP notifications (traps and
informs) specific to individual Virtual Private Networks (VPNs).
notifications (traps and informs) using VPN routing/forwarding (VRFs) tables. In particular, this feature
adds support to Cisco IOS software for the sending and receiving of SNMP notifications (traps and
informs) specific to individual Virtual Private Networks (VPNs).
The Simple Network Management Protocol (SNMP) is an application-layer protocol that provides a
message format for communication between SNMP managers and agents.
message format for communication between SNMP managers and agents.
A Virtual Private Network (VPN) is a network that provides high connectivity transfers on a shared
system with the same usage guidelines as a private network. A VPN can be built on the Internet over IP,
Frame Relay, or ATM networks.
system with the same usage guidelines as a private network. A VPN can be built on the Internet over IP,
Frame Relay, or ATM networks.
A VRF stores per-VPN routing data. It defines the VPN membership of a customer site attached to the
network access server (NAS). A VRF consists of an IP routing table, a derived Cisco Express Forwarding
(CEF) table, and guidelines and routing protocol parameters that control the information that is included
in the routing table.
network access server (NAS). A VRF consists of an IP routing table, a derived Cisco Express Forwarding
(CEF) table, and guidelines and routing protocol parameters that control the information that is included
in the routing table.
The SNMP Support for VPNs feature provides configuration commands that allow users to associate
SNMP agents and managers with specific VRFs. The specified VRF is used for the sending of SNMP
notifications (traps and informs) and responses between agents and managers. If a VRF is not specified,
the default routing table for the VPN is used.
SNMP agents and managers with specific VRFs. The specified VRF is used for the sending of SNMP
notifications (traps and informs) and responses between agents and managers. If a VRF is not specified,
the default routing table for the VPN is used.
Benefits
This feature allows users to configure an SNMP agent to only accept SNMP requests from a certain set
of VPNs. With this configuration, providers can provide network management services to their
customers, so customers can manage all user VPN devices.
of VPNs. With this configuration, providers can provide network management services to their
customers, so customers can manage all user VPN devices.
Configuration Tasks
See the following sections for configuration tasks for the SNMP Support over VPNs feature. Each task
in the list is identified as either required or optional:
in the list is identified as either required or optional:
•
•
(optional)
Configuring SNMP Support for a VPN
To configure SNMP over a specific VPN, use the following command in global configuration mode:
Command
Purpose
Router(config)# snmp-server host host-address [traps |
informs
][version {1 | 2c | 3 [auth | noauth |priv]}]
community-string [udp-port port][notification-type][vrf
vrf-name]
Specifies the recipient of an SNMP notification
operation and specifies the VRF table to be used for the
sending of SNMP notificiations.
operation and specifies the VRF table to be used for the
sending of SNMP notificiations.