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gohlex8848
Beginner

voice traffic EF outbound / inbount packet count

Hi Guys,

Hope I can seek a little help here.

I've MLP QOS configured on my lab and I notice that the ef packet count for outbound and inbound on the router WAN interface are almost identical.

For example I've two office, HQ and Branch, both office have phones registered to CUCM located at HQ and there is a 384 WAN link between.

both voice gateway are running MGCP. When the call is established, I notice the following output:

HQ Router

Service-policy input: EF-Inbound

    Class-map: AutoQoS-VoIP-RTP-Trust (match-any)

      332 packets, 21248 bytes

      5 minute offered rate 6000 bps

      Match: ip dscp ef (46)

        332 packets, 21248 bytes

        5 minute rate 6000 bps

    Class-map: class-default (match-any)

      11 packets, 674 bytes

      5 minute offered rate 0 bps, drop rate 0 bps

      Match: any

  Service-policy output: AutoQoS-Policy-Trust

    queue stats for all priority classes:

      Queueing

      queue limit 64 packets

      (queue depth/total drops/no-buffer drops) 0/0/0

      (pkts output/bytes output) 335/20770

    Class-map: AutoQoS-VoIP-RTP-Trust (match-any)

      335 packets, 20770 bytes

      5 minute offered rate 8000 bps, drop rate 0 bps

      Match: ip dscp ef (46)

        335 packets, 20770 bytes

        5 minute rate 8000 bps

      Priority: 33% (126 kbps), burst bytes 3150, b/w exceed drops: 0

Branch Router

Virtual-Access3

  Service-policy input: EF-Inbound

    Class-map: AutoQoS-VoIP-RTP-UnTrust (match-any)

      190 packets, 12160 bytes

      5 minute offered rate 10000 bps

      Match: protocol rtp audio

        190 packets, 12160 bytes

        5 minute rate 10000 bps

      Match: access-group name AutoQoS-VoIP-RTCP

        0 packets, 0 bytes

        5 minute rate 0 bps

    Class-map: class-default (match-any)

      12 packets, 1712 bytes

      5 minute offered rate 0 bps, drop rate 0 bps

      Match: any

  Service-policy output: AutoQoS-Policy-UnTrust

    queue stats for all priority classes:

      Queueing

      queue limit 64 packets

      (queue depth/total drops/no-buffer drops) 0/0/0

      (pkts output/bytes output) 188/11656

    Class-map: AutoQoS-VoIP-RTP-UnTrust (match-any)

      187 packets, 11594 bytes

      5 minute offered rate 10000 bps, drop rate 0 bps

      Match: protocol rtp audio

        187 packets, 11594 bytes

        5 minute rate 10000 bps

      Match: access-group name AutoQoS-VoIP-RTCP

        0 packets, 0 bytes

        5 minute rate 0 bps

      QoS Set

        dscp ef

          Packets marked 188

      Priority: 33% (126 kbps), burst bytes 3150, b/w exceed drops: 0

As my understanding, aren't the inbound ef packet count should be same or at least close to the number of the sender's outbound?

for this example HQ is sending 335 packet and isn't Branch should be receiving 335 ef packet? (assuming no packet lost)

Also i notice on the same router, the inbound / outbound ef packet count is almost identical, is that correct pattern for voice traffic?

When checking the statistics on the phone and is showing the same.

if I've have huge number mismatch on this will that means the call suffer quality issue?

Appreciate if someone can enlighten me on this.

Thanks

Regards,

Alex

1 REPLY 1
gohlex8848
Beginner

Any kind soul can advise?

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