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Enabling
Prioritization for
SpectraLink Phones
For example, to enable VoIP support for TeleSym packets, which use UDP
port 3344, for all users in VLAN corp_vlan, perform the following steps:
1 Configure an ACE in ACL voip that assigns IP traffic from any IP address
with source UDP port 3344, addressed to any destination address, to CoS
queue 4:
WX1200# set security acl ip voip permit cos 4 udp 0.0.0.0
255.255.255.255 eq 3344 0.0.0.0 255.255.255.255
2 Configure another ACE to change the default action of the ACL from
deny to permit. Otherwise, the ACL permits only voice traffic that
matches the previous ACE and denies all other traffic.
WX1200# set security acl ip voip permit 0.0.0.0
255.255.255.255
3 Commit the ACL to the configuration:
WX1200# commit security acl voip
4 Map the ACL to the outbound traffic direction of VLAN corp_vlan:
WX1200# set security acl map voip vlan corp_vlan out
You can configure MSS to prioritize voice traffic for VoIP phones that use
SpectraLink Voice Priority (SVP). When you enable SVP support, MSS
ensures voice quality for SpectraLink phones using SVP by allocating CoS
queues 6 and 7 on the MAP for the distinct SVP treatment as well as
forwarding all traffic from that queue before forwarding traffic from
other queues.
You can enable SVP support on a VLAN, port group, port list, virtual port
list, Distributed MAP, or user glob. To enable SVP support, configure an
ACL that assigns traffic for IP protocol 119 to CoS queue 6 or 7 and map
the ACL to the outbound traffic direction.
For example, to enable SVP support for all users in VLAN corp_vlan,
perform the following steps:
1 Configure an ACE in ACL svp that assigns IP protocol 119 traffic for all
source and destination addresses to CoS queue 7:
WX1200# set security acl ip svp permit cos 7 119 0.0.0.0
255.255.255.255 0.0.0.0 255.255.255.255
2 Configure another ACE to change the default action of the ACL from
deny to permit. Otherwise, the ACL permits only voice traffic that
matches the previous ACE and denies all other traffic.
Enabling Prioritization for Voice over IP
251
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