Specifications

5
Release Notes for Cisco MGX 8880 Software Release 5.4.00
OL-11772-01
New Features
dspccdprofs Display clear channel data profiles
Unique Virtual Gateway Domain Name for H.248
For H.248 applications, a VXSM card has the capability of being partitioned into a number of virtual
media gateways (VMGs); where each VMG is a logical entity residing within a physical VXSM card.
This feature permits each virtual gateway to be assigned its own unique domain name.
The Unique Virtual Gateway Domain Name feature modifies the following commands:
addh248assoc Add H.248 association
cnfh248mg Configure H.248 media gateway
dsph248assoc List configuration of H.248 Association
dsph248mg List configuration of H.248 Gateway
ptime Support for H.248
The ptime (packet period) attribute is defined in RFC 2327 as “the length of time in milliseconds
represented by the media in a packet.” ptime specifies the packet period for a codec, and maxptime
specifies the maximum packet period.
The ptime and maxptime attributes are optional SDP attributes that can be sent down by the MGC in
the local or remote descriptor SDP.
In release earlier than 5.4.00, the values of ptime and maxptime were ignored and the values configured
on the platform were used.
Bidirectional Forwarding Detection Version 1
Bidirectional Forwarding Detection version 1 (BFDv1) improves protocol convergence times by rapidly
detecting failures in the path between routers. This is especially important for media that does not
provide failure signaling, such as Ethernet, because the OSPF protocol can take a second or more to
detect a signaling loss using hello messages. This is too long for some applications and can result in
excessive data loss, especially at gigabit rates. BFDv1 quickly detects a media failure so that the OSPF
protocol can quickly update routes.
DSCP Marking on RPM-XF Management Interface
Cisco IOS Release 12.4(14)T supports Differentiated Services Code Point (DSCP) or IP Precedence
marking for quality of service (QoS) configurations on the RPM-XF management back cards. With this
enhancement, the RPM-XF supports Layer 3 QoS on the Fast Ethernet management back card.
Limitations
The following limitations apply to the DSCP marking of management packets on the RPM_XF
management back card:
• The RPM-XF does not support DSCP marking for the interface to the MGX switch cell bus.
• The RPM-XF management back card can be used for only management traffic, not data traffic.