My network uses cisco IP phones (primarily model 7942) connecting to 2960 switches. The VoIP servers are at a remote location, requiring voice QoS be preserved end-to-end.
On the access-level switches I have the following configured on each port to which a phone is attached:
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srr-queue bandwidth share 10 10 60 20
priority-queue out
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
service-policy input AutoQoS-Police-CiscoPhone
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On the router (router2) that hands off traffic to our upstream ISP I have the following config:
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class-map match-any Voip
match ip dscp ef
class-map match-any Bulk-Data
match ip dscp af11 af12 af13
class-map match-any Network-Control
match ip dscp cs6
match ip dscp cs2
class-map match-any Critical-Data
match ip dscp af21 af22 af23
class-map match-any Voip-Signaling
match ip dscp cs3
match ip dscp af31
class-map match-any Scavenger
match ip dscp cs1
!
policy-map qos
class Voip
priority percent 50
class Voip-Signaling
bandwidth percent 5
class Network-Control
bandwidth percent 5
class Critical-Data
bandwidth percent 20
random-detect dscp-based
class Bulk-Data
bandwidth percent 4
random-detect dscp-based
class Scavenger
bandwidth percent 1
class class-default
fair-queue
!
policy-map qos-20meg
class class-default
shape average 20000000
service-policy qos
interface GigabitEthernet0/0
description handoff to WAN
service-policy output qos-20meg
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However, these are not the only network devices the VoIP traffic needs to traverse at this end. The connections look like this:
[phone] -> [access-switch] -> [core-switch] -> [router1] -> [core-switch] -> [router2] -> WAN
My question is, what config do I need to put in place on the uplink ports between the switches and between the local routers and switches to preserve the VoIP?
access-switch is a 2960
core-switch is a 3750X
router1 is a 2911
router2 is a 2921.
Thanks,
-Mat
