Table Of Contents
Release Notes for Cisco Voice Switch Service Module (VXSM) Release 5.6.20
Revised: August 30, 2011, OL-23364-04
About This Release
The VXSM Release 5.6.20 follows VXSM Release 5.6.10. The resolved caveats for VXSM Release 5.6.20 are listed in Table 4.
The Voice Switch Service Module (VXSM) product is supported by the MGX 8880 Media Gateway and the MGX 8850 Multiservice Switch. Refer to their respective release notes for platform and version level support guidelines.
Note To verify that you have the latest version of Cisco IOS required to support the new features included in this release, please check Cisco IOS availability status at Cisco.com.
The VXSM software release notes are supported by Cisco Voice Switch Services (VXSM) Configuration Guide, Release 5.6.10 and Cisco Voice Switch Services (VXSM) Command Reference, Release 5.6.10, both of which are available on cisco.com.
New Features in Release 5.6.20
For each VXSM card type (OC-3/STM-1, T1/E1, or T3), two firmware images are available, namely, Non-CALEA and CALEA. When placing an order, the user must specify whether a Non-CALEA or CALEA image is required.
Both CALEA and Non-CALEA images supports three Media Gateway Control protocols, namely, H.248, MGCP, and TGCP. However, VXSM supports only one protocol at a time. The user must choose between the H.248, MGCP, and TGCP protocols when the image is first loaded from the PXM using the setrev command.
The CALEA image supports LI based on SII architecture for H.248, TGCP and MGCP protocols. The PktCable CALEA is supported only with MGCP and TGCP protocols.
VXSM supports four different Codec templates; Tandem Gateway (TGW), Tandem Gateway 2, Fixed Mobile Convergence (FMC), and Cable. The Cable template can be used only in conjunction with TGCP.
Upgrading from an Earlier VXSM Release
VXSM can be gracefully upgraded (configuration is preserved) from VXSM Release 5.5.11 or later.
Note VXSM supports upgrade of non-CALEA to CALEA firmware. But upgrade from CALEA to non-CALEA is not supported.
When loading or upgrading a boot or runtime image to a VXSM card, users must observe the following caution:
Caution If an H.248 association is active with SrvChgProfile (used in service change message) as BT_TGW in 5.3.x.x release, after graceful upgrade to supported releases, the association will continue to use BT_TGW, but new association(s) cannot be added with SrvChgProfile as BT_TGW.
From the 5.4.00 release onward, the BT_TGW SrvChgProfile is no longer available. All new associations must be added using either etsi_tgw or CISCO_TGW.
Prior to upgrade, user should confirm that additional termtypes (other than the defaults) have not been configured for VXSM in H.248.
Interrupted Procedure Recovery
In the event that a VXSM software upgrade procedure is interrupted (for example, power outage), and both Primary and Secondary are stuck in 'Failed-U' state, perform the following procedure:
Step 1 Execute the abortrev command:
abortrev <PrimarySlot> <NewImageRevision>
Step 2 If the primary VXSM becomes "Failed/Active" (out of Failed-U/Active"), then execute the resetcd command
Step 3 If the secondary VXSM becomes "Failed/Active" (out of Failed-U/Active"), then execute the resetcd command:
Step 4 Both primary and secondary VXSM cards should now have their original SW image and original DB
Call Rate Performance Support
VXSM OC3 Card supports the following call rates:
•In MGCP, the maximum CPS supported is 60 (without signaling). If signaling (M3UA/IUA/RUDP) is configured, then the maximum supported CPS is 50.
•In H.248, the maximum CPS supported is 85 (without signaling). If signaling (M3UA/IUA) is configured, then the maximum supported CPS is 50.
Online Diagnostics Feature as Applied to VXSM
The online diagnostics feature as implemented on the PXM45 card is supported on VXSM. When enabled, using the PXM45 cnfdiag command, this feature performs non-intrusive diagnostics tests that use four of the VXSM G711 DSP resources.
If the user executes the VXSM dspdspcodecpools command, the resulting display shows the four G711 DSP resources being used (for diagnostics) and subtracts them from the remaining available Codecs (see example below).mgx.3.VXSM.a > dspdspcodecpools=====================================================================DSP codec capacity usage=====================================================================Codec pool Current utilized Current availablecapacity (#DSP chans) capacity (#DSP chans)========== ===================== =====================G711 family/HDLC 179 7885G729/G726/T.38 family 0 3919G723 family 0 2911
In this example, 175 G711 calls have been established along with four G711 resources used for diagnostics.
The online diagnostics feature does not reduce the maximum number of 8064 G711 DSP resources available for calls on the VXSM card. If the number of call requests on the VXSM is sufficiently high, the online diagnostic feature is disabled automatically and the four Codecs are made available for active calls.
DSP Resources Under Mixed Codec Conditions
When the same Codec is used to setup calls on the gateway the available DSP resources will be fully utilized. However when different Codecs are used to setup calls the amount of utilizable DSP resources may be limited in certain cases due to resource fragmentation.
Fragmentation is said to have occurred when the available capacities on two different DSP resources have enough available capacity to support a call of a particular Codec type but cannot support that Codec type individually.
Consider two DSP resources whose available capacity is 1 unit each making the total available capacity 2 units. However a Codec that requires 2 units cannot be supported in the system because the available capacities have been fragmented across the individual DSP resources.
The DSP allocation algorithm on VXSM does make an attempt to smooth the effects of fragmentation. Fragmentation can happen because the pattern of future calls cannot be predicted beforehand.
VXSM Management Information Base
The VXSM Management Information Base (MIB) Version 5.6.20 is available to users with CCO accounts who can access the MIB and VXSM software on-line at: http://www.cisco.com/public/sw-center/index.shtml
Step 1 Log on to http://www.cisco.com/public/sw-center/index.shtml
Step 2 Locate the VXSM platform (either VXSM 8880 or VXSM 8850) and click the down arrow to expand the "Select Release Level" drop down menu.
Step 3 Select the desired MIB release level (for example, Release 5500) to display a list of downloadable files.
Step 4 Click on the desired file (for example, mgx8850-fw-5500.tar).
Step 5 Read the license agreement and, if approved, click Accept.
Step 6 In the Software Download dialog box, click on Download: filename (where filename is the name of the file selected for download). This step starts the download procedure.
Step 7 Follow the normal file download procedure for your computer.
Step 8 When the file has been downloaded, untar or unzip the downloaded file. The MIB file is included in the downloaded file and is listed as a tar file (for example mgx8850rel5500mib.tar).
Step 9 Untar the MIB file to display its contents.
Service Module Support by Platform
Note VXSM Release 5.6.20 is supported only with PXM-45/B and 45/C.
VXSM software interoperability with the MGX 8880 Media Gateway or the Cisco MGX 8850 (PXM45) Multiservice Switch platform software is listed in Table 1.
Table 2 describes the software images available for Release 5.6.20 for VXSM.
Caveats for VXSM Release 5.6.20
This section describes software caveats for Release 5.6.20.
Open Caveats in Release 5.6.20
Table 3 describes the open caveats in VXSM Release 5.6.20.
Resolved Caveats in Release 5.6.20
Table 4 describes the caveats resolved in VXSM Release 5.6.20.
The following documents contain information that may be useful to software Release 5.6.20 for VXSM:
•Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, and Cisco MGX 8830 Hardware Installation Guide, Releases 2 Through 5.3
•Cisco ATM Services (AXSM) Configuration Guide and Command Reference for MGX Switches, Release 5.2
•Cisco MGX Route Processor Module (RPM-XF) Installation and Configuration Guide, Release 5.5
•Cisco MGX 8880 Media Gateway, Release 5.5: A Guide to User Documentation.
•Release Notes for Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, and Cisco MGX 8830 Switches, Release 5.6.10
Obtaining Documentation, Obtaining Support, and Security Guidelines
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