These release notes describe new features for the Cisco 2600 series routers that support Cisco IOS Release 12.0(2)XC. Cisco IOS Release 12.0(2)XC is based on Cisco IOS Release 12.0(2)T.
The Cisco 2600 series modular architecture provides the versatility needed to adapt to changes in network technology as new services and applications become available. Driven by a powerful reduced instruction set computer (RISC) processor, the Cisco 2600 series supports the advanced Quality of Service (QoS), security, and network integration features required in today's evolving enterprise networks.
This release note document is based on Cisco IOS Release 12.0(2)T. Release 12.0 T is an Early Deployment (ED) release, delivering fixes to software caveats and support for new Cisco hardware. Use the information in this section to determine which early deployment release you require.
Release 12.0(2)T is an ED release with no addtional software or hardware features from the previous release.
Cisco 2620 and Cisco 2621 routers with 10/100 Ethernet interfaces are not supported in Release 12.0(2)T.
Release 12.0(2)XD is an ED release with the additional functionality of the ISDN BRI VoIP voice interface card, which provides narrowband digital voice connectivity in Cisco VoIP.
Cisco 2620 and Cisco 2621 routers with 10/100 Ethernet interfaces are not supported in Release 12.0(2)XD.
Release 12.0(2)XC is an ED release with two additional platforms---the Cisco 2620 and the Cisco 2621.The Cisco 2620 router supports the 1-port 10/100 Ethernet interface, and the Cisco 2621 router supports the 2-port 10/100 Ethernet interface.
Cisco 2620 and Cisco 2621 routers with 10/100 Ethernet interfaces are supported in Release 12.0(2)XC.
Release 11.3(7)T is an ED release with no additional software or hardware features from the previous release.
Cisco 2620 and Cisco 2621 routers with 10/100 Ethernet interfaces are not supported in Release 11.3(7)T.
The following table briefly describes some of the ED releases available now and soon to be available for the Cisco 2600 series.
This section describes the system requirements for Release 12.0(2)XC and includes the following subsections:
Table 2 describes the memory requirements of the Cisco IOS feature sets for the Cisco 2600 series for Release 12.0(2)XC. All "Plus" feature sets include voice network support.
Note The Cisco 2620 and Cisco 2621 routers are only available with Cisco IOS Release 12.0(2)XC and later. For more information, refer to the "Early Deployment Releases" section.
For detailed descriptions of the new hardware features for Release 12.0, refer to the cross-platform Release Notes for Cisco IOS Release 12.0 T. Table 3 lists the interfaces supported by the Cisco 2600 series.
Note The 1- or 2-port 10/100 Ethernet LAN interface for the Cisco 2621 and Cisco 2621 routers is only available in Release 12.0(2)XC and later. The ISDN BRI VoIP Voice Interface Card is only available in Release 12.0(2)XD and later. For more information, refer to the "Early Deployment Releases" section.
For information on updating to a new software release, refer to the Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin located on CCO. On CCO, follow this path: Products & Ordering: More Information: Product Bulletins. Scroll to Software. Under Cisco IOS 12.0, click the Upgrade Paths bulletin.
The feature set matrix (Table 4) shows the feature set organization and lists which feature sets are available on the Cisco 2600 series for Release 12.0(2)XC. Table 4 lists the feature set name, the feature set matrix term, the software image name, and the supported platforms.
4This feature is offered in the encryption feature sets which consist of 56-bit (Plus 56) data encryption feature sets.
5This feature is offered in the encryption feature sets which consist of IPsec 56-bit (Plus IPsec 56) data encryption feature sets.
Table 5 and Table 6 list the features and feature sets supported by the Cisco 2600 series in Cisco IOS Release 12.0(2)XC. Both tables use the following conventions to identify features:
This section lists some of the features available for the Cisco 2600 series in Cisco IOS Release 12.0(2)XC software. For more information about these features, refer to the cross-platform Release Notes for Cisco IOS Release 12.0 T located on Cisco Connection Online (CCO), the Documentation CD-ROM.
Note The ISDN BRI VoIP Voice Interface Card is only available in Release 12.0(2)XC and later. For more information, refer to the "Early Deployment Releases" section.
This section contains open and resolved caveats for the current Cisco IOS maintenance release only. For information on caveats in the Cisco IOS Release 12.0 T, refer to the "Caveats" section in the cross-platform Release Notes for Cisco IOS Release 12.0 T document located on CCO and the Documentation CD-ROM. This section contains caveats affecting all maintenance releases.
The [no] atm rmon collect group-num does not properly take effect when invoked. The ATM-RMON feature (available only on the LS-1010 platform) is fully functional, except the assignment of ATM interfaces to ATM-RMON collection groups must be done by setting the associated MIB objects with SNMP. See the portSelTable definitions in the ATM-RMON-MIB.my MIB document for more information.
There might be an issue with a second call being placed to a station that is currently in call_setup or connected. This only appears where the call is being forwarded via an intermediate router.
When using sparse-mode PIM multicast, it might take up to five minutes from boot up of the routers until the multicast tree stabilizes. During this period, PATH messages sent to multicast addresses will not be delivered, and hence RSVP path and reservation sessions will not be established. This is a transient phenomenon which occurs only when the routers are being booted. Once the multicast tree stabilizes, paths/reservations are established quickly.
The Token-Ring Inter-Switch Link (TR-ISL) feature is currently not supported on either the Cisco 3620 or Cisco 3640. There is no workaround.
If flow-acceleration is enabled and subsequently disabled and if encryption is also subsequently enabled, the router might unexpectedly reload.
Under rare circumstances, if an incoming call is terminated by the caller, the IP portion of the call might not be terminated correctly. This only occurs under very specific timing conditions.
Cisco 800 routers can experience a page leak after prolonged usage. This condition is rare (roughly 1 in 50 units experience it) and might take several days to manifest, depending on the number of calls.
When this problem occurs, performance degrades until the unit thrashes (for example, runs so slow that no useful work is accomplished). This is accompanied by continuous and heavy blinking of the OK LED.
To cause a leak, the router must allocate a large block of memory, read from that memory, deallocate the block, allocate another large block, and write to it without reading from it. The alloc/read/free case (without any intervening writes) is very rare and typically only occurs during call setup failure with multilink (MLPPP) and/or compression configured.
ARP replies out a bridged PPP over ATM with IRB interface will fail to be sent. To intall the ARP entries, initiate traffic from the router and force an incoming ARP reply.
Removing a dialer interface while a call is up can result in the loss of use of one B channel. A reload of the router will bring it back.
The following documents are specific to the Cisco 2600 series and are available online at Cisco Connection Online (CCO) and on the Documentation CD-ROM:
Feature modules describe new features supported by Release 12.0(2)XC and 12.0(2)T, and are an update to the Cisco IOS documentation set. They consist of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the features modules are available online only. The feature module information is included in the next printing of the Cisco IOS documentation set.