We're using Cisco 2811's at branch sites. I need help with the QoS configuration on the Fast0/0 interface and also for the NM-16ESW. We're testing on a cable modem connection (yes I know this is not optimal) with 6 Mbps download and 512 Mbps upload. All works great except for when I stress test the WAN link.
I have the following config for Fast 0/0:
class-map match-any QoS-VoIP-RTP-Trust
match protocol rtp audio
match access-group name QoS-VoIP-RTCP
class-map match-any QoS-VoIP-Control-Trust
match access-group name QoS-VoIP-Control
description Road Runner Cable Modem
ip address dhcp
ip nat outside
crypto map 3DESmap
service-policy output QoS-Policy-Trust
ip access-list extended QoS-VoIP-Control
permit tcp any any eq 1720
permit tcp any any range 11000 11999
permit udp any any eq 2427
permit tcp any any eq 2428
permit tcp any any range 2000 2002
permit udp any any eq 1719
permit udp any any eq 5060
ip access-list extended QoS-VoIP-RTCP
permit udp any any range 16384 32767
No packets voice packets are being classified as voice:
On the NM-16ESW ports I have the following configured for all ports:
switchport voice vlan 2
mls qos trust cos
Can someone please help me with both the QoS config for Fast0/0 (the WAN interface) and also for the NM-16ESW interfaces? Can we also police the inbound interface to ensure some room is left for voice packets? Can you provide an example?
If I remove the last option (option 52) from the emulated dhcp discovery packet the cable modem successfully answer the cisco request with a dhcp offer. Further actions like answering to the dhcp offer are beyond the scope of my test and no further actions were taken by the emulation program.
Option 52 is used by DHCP as an additional space in case the server needs to send back additional data to the client. For some reason the cable modem is not answering the cisco request if this option is present.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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