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Table Of Contents
Release Notes for Cisco IOS Release 15.1(4)GC and Later
Image Information and Supported Platforms
New Features for Cisco IOS 15.1(4)GC
New Hardware Features for Cisco IOS 15.1(2)GC
New Software Features for Cisco IOS 15.1(2)GC
Recommended Configuration Settings
Open Caveats for Cisco IOS Release 15.1(4)GC1
Closed Caveats for Cisco IOS Release 15.1(4)GC1
Open Caveats for Cisco IOS Release 15.1(4)GC
Closed Caveats for Cisco IOS Release 15.1(4)GC
Open Caveats for Cisco IOS Release 15.1(2)GC2
Closed Caveats for Cisco IOS Release 15.1(2)GC2
Obtaining Documentation, Obtaining Support, and Security Guidelines
Release Notes for Cisco IOS Release 15.1(4)GC and Later
Current Release: 15.1(4)GC1 January 16, 2013
Previous Releases:
15.1(2)GC2 February 9, 2012
The following release notes support Cisco IOS Release 15.1(4)GC. They are updated to describe new features, limitations, troubleshooting, recommended configurations, caveats, and how to obtain support and documentation.
Contents
This publication consists of the following sections:
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Image Information and Supported Platforms
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Image Information and Supported Platforms
These images are bug compatible with Cisco IOS release 15.1(4)M5.
Cisco IOS Release 15.1(4)GC includes the following Cisco IOS images:
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Note
Cisco IOS Release 15.1(4)GC is supported on the following platforms:
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Related Documentation
The following documentation is available for use:
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New and Changed Information
This section contains the following information.
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New Features for Cisco IOS 15.1(4)GC
: 15.1(4)GC supports all features supported in 15.1(4)M as well as all features supported in 15.1(2)GC. Refer to the following URL for information on the new software features added to Release 15.1M: http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151-4MNEWF.html
New Hardware Features for Cisco IOS 15.1(2)GC
The following new hardware is supported in 15.1(2)GC:
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For detailed information, refer to the following document:
Cisco 5940 Embedded Services Router Hardware Technical Reference Guide (OL-23875-01)
New Software Features for Cisco IOS 15.1(2)GC
Cisco IOS Release 15.1(2)GC is based on Cisco IOS Release 15.1T. Refer to the following URL for information on the new software features added to Release 15.1T: http://www.cisco.com/en/US/docs/ios/15_1/release/notes/15_1m_and_t.html
The following new software feature has been added to this release:
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Limitations
The following limitations exist in this release:
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A QoS output policy can be applied to the Virtual Template or the VMI, but not at the same time. If a policy is attached, the outgoing physical interfaces (i.e., physical-interface FastEthernet0/0) should not have output policy applied. It is recommended that the policy be attached to the Virtual Template. The other option is to apply the policy to the VMI, but not to the Virtual Template or Ethernet interface.
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To prevent dropping QoS policy, the current data rate (CDR) is range checked to a floor value of 80kbps and a ceiling value of 154400kbps. If CDR is below the floor value, the QoS rate shaping is set to the floor value. If CDR is above the ceiling value, the QoS rate shaping is set to the ceiling value.
In addition to defining floor and ceiling bandwidth values, the class bandwidth percentage must also be 10% or greater. If the class bandwidth is configured to a value less than 10% and the CDR value is less than 80kbps, the QoS policy will be removed. (CSCth43582)
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Troubleshooting
Use the following command to collect data when reporting router issues:
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Use the following command to collect data to confirm neighbor establishment:
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Use the following command to display active PPPoE sessions:
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Use the following command to examine QoS issues:
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Use the following commands to debug vmi issues:
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Use the following commands to verify PPPoE and VMI interface operation related to credit information:
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Use the following command to debug PPPoE issues:
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Use the following command to display OSPFv3 traffic data including LSA counts:
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Use the following command to display EIGRP traffic data:
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The following command is not supported, but may be useful in debugging EIGRP MANET metric issues:
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Use the following command to collect data when reporting ROMMON issues:
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Complete the following procedure to collect data if a router reboot to rommon occurs:
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Recommended Configuration Settings
Use the following configuration guidelines when enabling class-based weighted fair-queuing:
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no virtual-template subinterface•
class-map match-any chatmatch dscp af11class-map match-any voicematch dscp efpolicy-map mypolicyclass chatbandwidth percent 40class voicebandwidth percent 40interface virtual-template numberservice-policy output mypolicy•
Use the following configuration guidelines when disabling PPP keepalives:
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interface virtual-template numberno keepaliveUse the following configuration guidelines for setting the recommended OSPF values of radio link metrics:
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The following is an example configuration for a VMI interface or on the virtual template when running bypass mode:
interface vmi1...ospfv3 4 cost dynamic weight throughput 0ospfv3 4 cost dynamic weight resources 29ospfv3 4 cost dynamic weight latency 29ospfv3 4 cost dynamic weight L2-factor 29For more information on OSPF commands, refer to the following URL: http://www.cisco.com/en/US/docs/ios/iproute_ospf/command/reference/iro_book.html
Use the following configuration guidelines for disabling split horizon in EIGRP:
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interface vmi numberno ip split-horizon eigrp as-number•
interface vmi numberno ip redirectsUse the following configuration guidelines for setting EIGRP values of radio link metrics:
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metric weights tos k1 k2 k3 k4 k5where tos denotes type of service (currently, it must always be zero) and use the following default values for weights:
k1 - 1 k4 - 0
k2 - 0 k5 - 0
k3 - 1
The no metric weights command restores the k-values to the above listed defaults:
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Note
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ip50-1(config)#int vmi 4ip50-1(config-if)#eigrp 100 interface dampening-change 40Default Value for Change Based Dampening: 50%
To enable change-based dampening using the default Value, enter the following command:
eigrp 100 interface dampening-changeTo disable change-based dampening, enter the following command:
no eigrp 100 interface dampening-change–
ip50-1(config)#int vmi 4ip50-1(config-if)#eigrp 100 interface dampening-interval 20Default Timer value for Interval-based Dampening: 30 seconds
To enable interval-based dampening using the default Value, enter the following command:
eigrp 100 interface dampening-intervalTo disable interval-based dampening, enter the following command:
no eigrp 100 interface dampening-interval•
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For more information on EIGRP commands, refer to the following URL: http://www.cisco.com/en/US/docs/ios/iproute_eigrp/command/reference/ire_book.html
Caveats
Caveats describe unexpected behavior in Cisco IOS releases. Caveats listed as open in a prior release are carried forward to the next release as either open or closed (resolved).
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Open Caveats for Cisco IOS Release 15.1(4)GC1
Cisco IOS Software Release 15.1(4)GC1 has no opened caveats
Closed Caveats for Cisco IOS Release 15.1(4)GC1
This section lists closed caveats in the Cisco IOS Release 15.1(4)GC1.
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Cisco IOS Software contains a memory leak vulnerability that could be triggered through the processing of malformed Session Initiation Protocol (SIP) messages. Exploitation of this vulnerability could cause an interruption of services. Only devices that are configured for SIP inspection are affected by this vulnerability.
Cisco has released free software updates that address this vulnerability. There are no workarounds for devices that must run SIP inspection.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130327-cce
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The Cisco IOS Software Protocol Translation (PT) feature contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130327-pt
Note: The March 27, 2013, Cisco IOS Software Security Advisory bundled publication includes seven Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security Advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all Cisco IOS Software vulnerabilities in the March 2013 bundled publication.
Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar13.html
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The Smart Install client feature in Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
Affected devices that are configured as Smart Install clients are vulnerable.
Cisco has released free software updates that address this vulnerability. There are no workarounds for devices that have the Smart Install client feature enabled.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130327-smartinstall
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In Cisco IOS releases 15.1(4)GC and higher, if you configure a Zone-Based Policy Firewall (ZFW), the service policies are not attached to the configuration. The following error message is displayed.
% Error: Number of filters in the classmap exceeded the Limit. No Policy will be attached.
Firewall service-policy attachment failedOpen Caveats for Cisco IOS Release 15.1(4)GC
Cisco IOS Software Release 15.1(4)GC has no opened caveats.
Closed Caveats for Cisco IOS Release 15.1(4)GC
This section lists closed caveats in the Cisco IOS Release 15.1(4)GC. Cisco IOS Release 15.1(4)GC is bug and PSIRT compatible with Release 15.1(4)M5. For more information on Cisco IOS Release 15.1(4)M1, refer to the following URL: http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151-4MCAVS.html
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When two interfaces are configured with the same IP and same R2CP port number, but one is in a shutdown state, packets may not be processed correctly for R2CP and the session will not establish. This can only occur when one interface is shutdown as two ethernet interfaces on a single router cannot have the same IP address when they are both in a non-shutdown state.
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AGigabit Ethernet receive port stops receiving packets when the data rate exceeds 65%.
Open Caveats for Cisco IOS Release 15.1(2)GC2
This section lists open caveats in the Cisco IOS Release 15.1(2)GC2:
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Workaround: Disable R2CP on the shutdown interface or use different ports for each R2CP session. (CSCtk81703)
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Workaround: Enter the shutdown command followed by the no shutdown command for the interface to restart traffic. (CSCt083395)
Closed Caveats for Cisco IOS Release 15.1(2)GC2
This section lists closed caveats in the Cisco IOS Release 15.1(2)GC2:
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Multicast traffic drops 100% with zone-based firewall configured.
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Multicast and pim and bsr advertisements fails over unnumbered ppp link
Router running 15.1(2)T1 will reject bsr advertisements over ip unumbered link while router running 12.4(15)T14 will accept them.
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IPv6 Zone Firewall fails to create inspect session for certain addresses.
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5940 stops forwarding traffic when the data rate hits about 65% or more of line rate.
Obtaining Documentation, Obtaining Support, and Security Guidelines
For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at the following URL:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
Subscribe to the What's New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free service. Cisco currently supports RSS Version 2.0.
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