Avaya 38DHB0002UKDD manual Test end-to-endVoice and Data, Function, Method

How Do I?Part 2 Voice Over IP - Page 103

Step 6 - Test end-to-end Voice and Data

Once IP connectivity and VoIP have been configured, it is now important to prove the configuration. If the configuration is successful, there must not be any reduction in VoIP quality when VoIP and non-voice traffic are mixed on the link. Establish one or more VoIP calls on the line and begin a data transfer between two PC’s (establish as near to the maximum number of allowed calls as possible see VPN Line configuration page 99). When performing this test it is recommend that ping is not used to simulate non-voice traffic; copy a file using FTP or Windows networking as this will ensure that the QoS configuration is correctly exercised.

Using the IPNC System Monitor application options, it is possible to debug all aspects of the IPNC's functions and features. Generally, outputs are associated directly to any related standard. E.g. PPP monitor outputs will reference RFC terms relating to the PPP protocol.

The following table describes monitor options that may be useful for debugging QoS issues on IPNC. The table details the how to debug the following elements.

• Queue drops

• Multilink Fragmentation

• VPN line

• Header compression (IPHC)

In an operational environment, use the Monitor application with caution when remotely monitoring over slow speed WAN link. Ensure only the minimum options are set before remotely monitoring, for example monitor Interface packets in one direction at a time.

Function	Method
Queue drops	Default monitor option shows the Voice and non-voice queue drops
	15604mS PRN: Discards – Norm 2 Voice 0
	16601mS PRN: Discards – Norm 2 Voice 0
	17619mS PRN: Discards – Norm 2 Voice 0
	Norm = drops from the non-voice queue
	Voice = drops from the voice queue
	Notes: 1. A well designed network should not experience any voice packets drops.
		2. The message is generated only when there are discards to the link.
Multilink	The output shown is taken using the following Monitor option
Fragmentation
	•	PPP/LCP Tx
	•	PPP/LCP Rx
	The highlighted text indicates the PPP Multilink option; e.g. the negotiation is
	successful
	5885mS PPP LCP Rx: v=wan_link_A1
	PPP LCP Config-Req(1) id=1 len=31
	MagicNum=0003709c
	Protocol field compression
	MRRU=1500
	ShortSeq
	EndPointDiscrim=mac 00e0070045aa
	MultiClass=6 Classes=4
	5885mS PPP LCP Tx: v=wan_link_A1

INDeX IPNC Cassette Administration Manual	How Do I? - Page 103
38DHB0002UKDD – Issue 7 (22/11/02)	Part 2 Voice Over IP