QOS: Output of "show policy-map" shows ATM overhead ?
Hi we are using MLPPPoATM in our WAN.
The ML is encrypted by using GETVPN and we are also using QOS on the ML. Configuration is like following
vc-class atm 1984Kbps-ATM<->FrameRelay-PVC
vbr-nrt 2162 2162 1 2162 2162 1
oam-pvc manage 0
interface ATM2/0.151 point-to-point
no atm enable-ilmi-trap
snmp trap link-status
pvc KIRC-KB01 1/151
protocol ppp Virtual-Template51
interface Virtual-Template51 description Virtual-Template for creating Multilink-Bundle 151 (2Mbit/s-ATM<->FrameRelay-PVC MLPPPoATM) no ip address load-interval 30 ppp multilink ppp multilink group 151
interface Multilink151 description 2Mbit/s-ATM<->FrameRelay-PVC MLPPPoATM bandwidth 1984 ip address 22.214.171.124 255.255.255.252 ip ospf network point-to-point load-interval 30 ppp multilink ppp multilink interleave ppp multilink group 151 ppp multilink fragment delay 10 crypto map MAP-BTV-SECURE-WAN service-policy output xQOS-QUEUE-POLICY
Now we are not sure what exactly show us the output of "show policy-map interface multilink 151" (the same also for "show int multilink 151") if we look to a particular class and the offered rate for this class, in
our case escecially for the class xQOS-CLASS-EF_Realtime_Voice where VOIP-traffic is in.
Lets assume we are using G729 which is created by a cisco IP-Phone
theoratically every 20ms there is sent one Packet with 141 Byte
PPP Header: 5 Byte
ML Header: 2 Byte (or 4 Byte)
GETVPN IP-Header: 20 Byte
ESP Header 52 Byte
IP Header: 20 Byte
UDP Header: 8 Byte
RTP Header: 12 Byte
Data: 20 Byte
FCS: 2 Byte
this would result in a 56,4kbps (141x8x50) over the ML
I would expect that the outout of the show policy-map int multilink 151 would show us this as offered rate
for the particular class.
One othe opinion is that a 141 Byte packet will nee need 3 ATM-cells a 53 Bytes which would result
in a 63,6kbps (2x53x8x50) Stream on the ATM
so the question is if we see in the outout of the show-commands the consumed BW with or without ATM-overhead?
Class-map: xQOS-CLASS-EF_Realtime_Voice (match-any) 4345203 packets, 802731086 bytes 30 second offered rate 0 bps, drop rate 0 bps (in this case there is no active call at the moment) Match: ip dscp ef (46) 4345203 packets, 802731086 bytes 30 second rate 0 bps Priority: 20% (396 kbps), burst bytes 9900, b/w exceed drops: 0
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