Table of Contents

15-6-2T

Release Notes for Cisco IOS Release 15.6(2)T

The following release notes support Cisco IOS Releases 15.6(2)T and higher releases. These releases support the Cisco 5900 Embedded Services Routers (ESR) platforms. These release notes 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:

- Image Information and Supported Platforms

- Related Documentation

- New Features Supported

- Caveats

- Obtaining Documentation and Submitting a Service Request

Image Information and Supported Platforms

Note You must have a Cisco.com account to download the software.

Cisco IOS Release 15.6(2)T includes the following Cisco IOS images:

- c5915-adventerprisek9-mz.SPA

- c5915-entbase-mz.SPA

- c5921i86-entbasek9-tar.SPA

- c5921i86-universalk9-tar.SPA

- c5930-adventerprisek9-mz.SPA

- c5940-adventerprisek9-mz.SPA

Related Documentation

The following documentation is available:

- Software Configuration Guide for the Cisco 5900 Embedded Services Routers

- Cisco 5921 Embedded Services Router Integration Guide

- IOS Bulletins—You can find bulletins at:

New Features Supported

The following new features are supported with release 15.6(2)T.

Add 200Mbps to the 5921

There are new licenses that support additional throughput speeds on the 5921. The c5921 universalk9 and entbasek9 images now support the 200Mbps PIDs shown in the following table.

License PID

Description

Enforced Rate in Mbps

LS-FL-5921-BL5-K9

Cisco 5921 ESR Base SW - 200 Mbps

200

LS-FL-5921-XL5-K9

Cisco 5921 ESR Adv Ent SW - 200 Mbps

200

L-FL-5921-XL5-K9

Cisco 5921 ESR Adv Ent SW - 200 Mbps

200

The Cisco 5921 ESR has the following limitation:

If you see such behavior, please issue the following debug command from IOS:

Now, try the ping again. If the VLAN tag stripping issue is present, you will see a "wrong cable" message similar to the following:

*Jan 14 21:49:50.874: IP ARP rep filtered src 192.168.110.2 e05f.b986.5500, dst 192.168.110.1 0022.4d7b.e424 wrong cable, interface Ethernet0/0.130

Now switch to the Linux command line and see if the e1000e driver is being used by issuing the following command (using eth0 as an example):

[root@router ~]# ethtool -i eth0

driver: e1000e <== LOOK FOR THIS

version: 2.3.2-k

firmware-version: 2.1-2

bus-info: 0000:02:00.0

supports-statistics: yes

supports-test: yes

supports-eeprom-access: yes

supports-register-dump: yes

supports-priv-flags: no

From the Linux command line, verify the VLAN mode of the device:

[root@router ~]# ethtool -d eth0

MAC Registers

-------------

0x00000: CTRL (Device control register) 0x58100248

Endian mode (buffers): little

Link reset: reset

Set link up: 1

Invert Loss-Of-Signal: no

Receive flow control: enabled

Transmit flow control: enabled

VLAN mode: enabled <== LOOK FOR THIS

Auto speed detect: disabled

Speed select: 1000Mb/s

Force speed: no

Force duplex: no

If the VLAN mode is enabled, this indicates that the driver is stripping the VLAN tags.

To remedy this using CentOS, please upgrade to the latest e1000e driver by following these steps from the Linux command line:

#yum install kernel-devel gcc gcc-c++ make wget

#reboot

#mkdir /usr/local/src/e1000e

#cd /usr/local/src/e1000e

#wget http://sourceforge.net/projects/e1000/files/e1000e%20stable/3.0.4/

#tar zxf e1000e-3.0.4.tar.gz

#cd e1000e-3.0.4

#cd src

#make install

If the process ends with the following message, ignore it:

/bin/sh: man: command not found

#rmmod e1000e

#modprobe e1000e

From the Linux command line, verify that the new driver has been activated:

[root@centos src]# ethtool -i eth0

driver: e1000e

version: 3.0.4-NAPI <== LOOK FOR THIS

firmware-version: 2.1-2

bus-info: 0000:02:00.0

supports-statistics: yes

supports-test: yes

supports-eeprom-access: yes

supports-register-dump: yes

supports-priv-flags: no

--------------------

Linux kernel patch which causes 802.1q tag removal is committed into the following streams:

Any Linux kernel within each of these streams that is at the above versions or later would have the 802.1q removal change. incorporated.

Add the below entry in the SWROPTIONS file when the Linux Kernel/driver strips dot1q tag before the packet reaches the 5921 (if running IOS version is 15.6(2)T ).

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).

Cisco IOS Release 15.6(2)T

The following sections list caveats for Cisco IOS Release 15.6(2)T:

Closed Caveats

- CSCuy31565

BIA address was not taking the NIC mac address in the 5921 router.

- CSCuy09274

When DLEP and multiple VMIs were used, multicast was not forwarded by the receiving router after re-routing between VMI interfaces.

- CSCuy30908

The 5940 router was crashing while launching the R2CP client session.

- CSCuy33157

There existed a condition on the 5921 router where an access point was moved to a disabled state, and then a reload command was issued, causing a crash with the router.

- CSCuy11462

The ping command was failing on the 5921 with Q_in_Q

- CSCuw55129

The 5921 router was unable to read the VLAN tags from Linux kernel-2.6.32-504.23.4.el6.i686 and later.

- CSCuy01278

On the 5921 router, the vlan dot1q tag was not working over bridge interface.

- CSCuw64684

On the 5921 router, packet loss was observed on over-subscription of queue in QOS in testing.

Open Caveats

- CSCuv99496

The CPU utilization reaches 100% while running DLEP v1.7.

:

May hit when running the combination of DLEPv1.7, R2CP and PPPOE.

There is no workaround.

- CSCuy87412

The script (c5921-swr-init.sh) that is delivered in the package with the 5921 tar image does not stop all the processes.

The c5921 process running on linux will not stop all the process related to the application when the script c5921-swr-init.sh stop is executed.

command.

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a service request, and gathering additional information, see What’s New in Cisco Product Documentation at: http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html.

Subscribe to What’s New in Cisco Product Documentation, which lists all new and revised Cisco technical documentation, as an RSS feed and deliver content directly to your desktop using a reader application. The RSS feeds are a free service.

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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