Cisco Cisco Unified MeetingPlace Express 2.0 Libro bianco
Cisco Systems
Network Provisioning and Configuration
Page 9
traditional (PSTN) links and voice gateways to achieve high voice quality for external
callers.
Voice end points can reduce their bandwidth usage by employing low-bit-rate coders or
compressed headers. Note, however, that Cisco MeetingPlace Express does not natively
support any CODEC except G.711; nor does it support compressed RTP. If you wish to
use a low-bit-rate coder, you will need to introduce a transcoder. Phone systems like
Cisco Call Manager will introduce a transcoding device (part of a media termination
point) automatically if one is necessary and available. However, transcoding will reduce
voice quality and increase latency.
callers.
Voice end points can reduce their bandwidth usage by employing low-bit-rate coders or
compressed headers. Note, however, that Cisco MeetingPlace Express does not natively
support any CODEC except G.711; nor does it support compressed RTP. If you wish to
use a low-bit-rate coder, you will need to introduce a transcoder. Phone systems like
Cisco Call Manager will introduce a transcoding device (part of a media termination
point) automatically if one is necessary and available. However, transcoding will reduce
voice quality and increase latency.
2.5 .2 W e b Co n f e r e n c i n g o v e r a W A N
The web conferencing engine does a reasonably good job of handling end points that are
either on a high performance core network, and thus not sensitive to bandwidth issues, or
at the end of a pipe where the available bandwidth is limited primarily by the client end
point’s local connection (modem or personal DSL link). Situations where multiple clients
share a slow or medium speed link are more problematical. An example is where you
have several people sharing a T1 line in a branch office.
In the shared line scenario, it is vital for the affected end users or the moderator to set the
connection speeds so that Cisco MeetingPlace Express will limit its output without
flooding the shared line. Failure to do this can have several negative effects, including:
either on a high performance core network, and thus not sensitive to bandwidth issues, or
at the end of a pipe where the available bandwidth is limited primarily by the client end
point’s local connection (modem or personal DSL link). Situations where multiple clients
share a slow or medium speed link are more problematical. An example is where you
have several people sharing a T1 line in a branch office.
In the shared line scenario, it is vital for the affected end users or the moderator to set the
connection speeds so that Cisco MeetingPlace Express will limit its output without
flooding the shared line. Failure to do this can have several negative effects, including:
•
Affected clients are likely to behave sluggishly.
•
Traffic between Cisco MeetingPlace Express and one client may flood the link
sufficiently to cause traffic to another client to fail, resulting in disconnections.
•
Other network-based applications may be prevented from performing normally.
2.6 E t h e r n e t Li n k Con f i g u r a t i on
The minimum recommended network link is 100Base-TX, full duplex. Systems with
more than about 40 web conferencing licenses will benefit from gigabit Ethernet.
By default, the Cisco MeetingPlace Express Ethernet adapters will auto-negotiate the
speed and duplex settings with the switch. However, experience shows this negotiation
can result in suboptimal settings and, in some cases, transient link failures and voice
dropouts. Consequently, we recommend using hardcoded settings for the link. Make sure
that the Cisco MeetingPlace Express and switch settings match.
Ethernet link settings can be configured using the net command (described in
Configuration Methods).
more than about 40 web conferencing licenses will benefit from gigabit Ethernet.
By default, the Cisco MeetingPlace Express Ethernet adapters will auto-negotiate the
speed and duplex settings with the switch. However, experience shows this negotiation
can result in suboptimal settings and, in some cases, transient link failures and voice
dropouts. Consequently, we recommend using hardcoded settings for the link. Make sure
that the Cisco MeetingPlace Express and switch settings match.
Ethernet link settings can be configured using the net command (described in
Configuration Methods).
3 B i n d i n g o f Se r v i c e s a n d Tr a f f i c
This chapter deals with how services are assigned to IP addresses and host names, DNS
configuration requirements, and controlling which traffic flows on which port.
The following are some best practices:
configuration requirements, and controlling which traffic flows on which port.
The following are some best practices: