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Alarms and troubleshooting features
Issue 5 June 2008 57
VoIP debugging using RTP-MIB
The G250/G350 includes the RTP-MIB feature for debugging QoS-related problems across the
VoIP network without any dedicated hardware. During each RTP stream, counters representing
various QoS metrics increment whenever configured thresholds for the metrics are exceeded. A
limited history of the QoS metric statistics is stored on the G250/G350 for active and terminated
RTP streams. Statistics can be displayed via the G250/G350 CLI. In addition, the G250/G350
can be configured to send SNMP traps to the SNMP trap manager on the S8xxx server at the
termination of each RTP stream that has QoS problems. The traps are converted to syslog
messages and stored for viewing in the messages file on the S8xxx server hard disk.
Object tracking
The G250/G350 includes object tracking. The purpose of object tracking is to track the state
(up/down) of remote devices using keepalive probes, and notify registered applications when
the state changes. Object tracking is utilized by applications such as VPN to track remote
devices and take certain steps when the state of a remote device changes.
Converged Network Analyzer (CNA) test plug
CNA test plugs are a component of CNA, a distributed system tool for real-time network
monitoring that detects and diagnoses converged network-related issues. CNA is deployed in the
G250/G350 to identify any network conditions or impairments that can degrade the user
experience for IP telephony and to monitor overall network performance. Test plugs in media
gateways provide the ability to measure end-to-end service to the edge of the PSTN, or at points
where codec changes are required for interworking between high (LAN) and low (WAN) speed
links.
Link Layer Discovery Protocol (LLDP)
LLDP simplifies network troubleshooting and enhances the ability of network management tools
to discover and maintain accurate network topologies in multi-vendor environments. LLDP
defines a set of advertisement messages (TLVs), a protocol for transmitting the TLVs, and a
method for storing the information contained in the received TLVs. This allows stations attached
to a LAN to advertise information about the system and about the station’s point of attachment
to the LAN to other stations attached to the same LAN. These can be reported to the
management station via SNMP MIBs.
On the G250, LLDP is supported on all the Ethernet LAN ports on the chassis.
On the G350, LLDP is supported on the Ethernet LAN ports located on the MM314 and MM316
media modules.