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119 - 165 IP Telephony v1.0 Lab 7.1.1 Copyright © 2005, Cisco Systems, Inc.
Target IP address: <ip_address>
Repeat count [5]: 1000
Datagram size [100]: 15000
Timeout in seconds [2]: <Enter>
Extended commands [n]: <Enter>
While the ping is occurring, place at least one phone call from one pod to another. Multiple calls
can be made. Have one pod partner slowly count from one to 10 while the phone connection is
active.
d. How is the voice quality? ______________________________________________________
e. On both CME routers in global configuration mode, enable CEF (Cisco Express Forwarding) on
both CME routers.
CMERouterX(config)# ip cef
f. What is the purpose of CEF? _____________________________________________________
_____________________________________________________________________________
g. On only one of the router pods, enable the AutoQoS for VoIP feature for traffic on the serial
interface. Do not configure AutoQoS to trust differential services code point (DSCP) markings.
Type the interface serial slot/mod/port command from global configuration mode to access the
serial interface.
CMERouterX(config)# interface serial
mod/port
CMERouterX(config-if)# auto qos voip
h. What happened to the serial link? _________________________________________________
i. On the pod that does not have QoS enabled yet, enable AutoQoS for VoIP. Note that the
module/port number that follows the serial parameter may be three digits separated by forward
slashes.
CMERouterX(config)# interface serial
mod/port
CMERouterX(config-if)# auto qos voip
j. Display and examine the running configuration and the resulting AutoQoS configuration after
enabling AutoQoS. The following is a sample output.
class-map match-any AutoQoS-VoIP-Remark
match ip dscp ef
match ip dscp cs3
match ip dscp af31
class-map match-any AutoQoS-VoIP-Control-UnTrust
match access-group name AutoQoS-VoIP-Control
class-map match-any AutoQoS-VoIP-RTP-UnTrust
match protocol rtp audio
match access-group name AutoQoS-VoIP-RTCP
!