Guest

IBM Networking

Ethernet Switch Network Module Restrictions for DLSW /DLSW Ethernet Redundancy

FIELD NOTICE

This Field Notice explains restrictions and configuration requirements for the NM-16ESW, NM-36ESW, and WIC-4ESW Ethernet Switch Modules, when both data-link switching plus (DLSw+) and IP routing are required.

PROBLEM DESCRIPTION

The NM-16ESW, NM-36ESW, and WIC-4ESW 10/100 Fast Ethernet Switch Network Modules impose restrictions for DLSw+ and IP addressing on the same interface. They also do not support the simultaneous use of the Ethernet Redundancy feature of DLSw+ and IP addressing on the same interface.

BACKGROUND

The NM-16ESW, NM-36ESW, and WIC-4ESW added support for bridging for Switched Virtual Interface (SVI) in Cisco IOS® Software Releases 12.2(15)ZJ and 12.3(4)T. This support requires the use of Integrated Routing and Bridging (IRB) to simultaneously bridge Logical Link Control (LLC) traffic and route IP traffic to SVI. This also precludes the simultaneous use of the Ethernet Redundancy feature of DLSw+ and IP addressing on the same interface. DLSw+ and the Ethernet Redundancy feature will operate normally, whether an IP address is configured or not, but the IP address routing will fail, when both are configured on a SVI.

PROBLEM SYMPTOMS

The symptom is that IP communication between the router and any end systems connected to the affected VLAN will not work.

WORKAROUND/SOLUTION

DLSw+ and IP routing can be configured to work together by using IRB. The following example shows how this might be configured.
Bridge irb
Dlsw local-peer peer-id 10.10.10.1
Dlsw remote-peer 0 tcp 10.20.20.1
Dlsw bridge-group 10
Dlsw bridge-group 20
Interface fastethernet 1
Switchport access-vlan 10
Interface fastethernet 2
Switchport access-vlan 20
Interface vlan 10
Bridge-group 10
Interface vlan 20
Bridge-group 20
Interface BVI 10
Ip address 10.10.10.1 255.255.255.0
Interface BVI 20
Ip address 20.20.20.1 255.255.255.0
Bridge 10 protocol ieee
Bridge 10 route ip
Bridge 20 protocol ieee
Bridge 20 route ip

Note: This notice affects the following products:

Product

Remarks

NM-16ESW

16-Port 10/100 Fast Ethernet Switch Module for Cisco 2600 and 3600 Series Multiservice Platforms and Cisco 3700 Multiservice Access Router

NM-36ESW

16-Port 10/100 Fast Ethernet Switch Module for Cisco 2600 and 3600 Series Multiservice Platforms and Cisco 3700 Series Multiservice Access Router

WIC-4ESW

4-Port 10/100 Fast Ethernet Switch Module for Cisco 1700 Series Modular Access Router

Text Box:  Corporate HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:   408 526-4000    800 553-NETS (6387)Fax: 408 526-4100    European HeadquartersCisco Systems International BVHaarlerbergparkHaarlerbergweg 13-191101 CH AmsterdamThe Netherlandswww-europe.cisco.comTel:  31 0 20 357 1000Fax:    31 0 20 357 1100    Americas HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:    408 526-7660Fax:    408 527-0883    Asia Pacific HeadquartersCisco Systems, Inc.168 Robinson Road#28-01 Capital Tower Singapore 068912www.cisco.comTel: +65 6317 7777Fax: +65 6317 7799Cisco Systems has more than 200 offices in the following countries and regions. Addresses, phone numbers, and fax numbers are listed on the Cisco Web site at www.cisco.com/go/offices.Argentina · Australia · Austria · Belgium · Brazil · Bulgaria · Canada · Chile · China PRC · Colombia · Costa Rica · Croatia · Cyprus  Czech Republic · Denmark · Dubai, UAE · Finland · France · Germany · Greece · Hong Kong SAR · Hungary · India · Indonesia · Ireland Israel · Italy · Japan · Korea · Luxembourg · Malaysia · Mexico · The Netherlands · New Zealand · Norway · Peru · Philippines · Poland Portugal · Puerto Rico · Romania · Russia · Saudi Arabia · Scotland · Singapore · Slovakia · Slovenia · South Africa · Spain · Sweden Switzerland · Taiwan · Thailand · Turkey · Ukraine · United Kingdom · United States · Venezuela · Vietnam · Zimbabwe                      Copyright  2004 Cisco Systems, Inc. All rights reserved. Cisco, Cisco Systems and the Cisco Systems logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0402R)      204044_ETMG_AE_08.04Printed in the USA Text Box:  Corporate HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:    408 526-4000    800 553-NETS (6387)Fax: 408 526-4100    European HeadquartersCisco Systems International BVHaarlerbergparkHaarlerbergweg 13-191101 CH AmsterdamThe Netherlandswww-europe.cisco.comTel:  31 0 20 357 1000Fax:    31 0 20 357 1100    Americas HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:    408 526-7660Fax:    408 527-0883    Asia Pacific HeadquartersCisco Systems, Inc.168 Robinson Road#28-01 Capital Tower Singapore 068912www.cisco.comTel: +65 6317 7777Fax: +65 6317 7799Cisco Systems has more than 200 offices in the following countries and regions. Addresses, phone numbers, and fax numbers are listed on the Cisco Web site at www.cisco.com/go/offices.Argentina · Australia · Austria · Belgium · Brazil · Bulgaria · Canada · Chile · China PRC · Colombia · Costa Rica · Croatia · Cyprus  Czech Republic · Denmark · Dubai, UAE · Finland · France · Germany · Greece · Hong Kong SAR · Hungary · India · Indonesia · Ireland Israel · Italy · Japan · Korea · Luxembourg · Malaysia · Mexico · The Netherlands · New Zealand · Norway · Peru · Philippines · Poland Portugal · Puerto Rico · Romania · Russia · Saudi Arabia · Scotland · Singapore · Slovakia · Slovenia · South Africa · Spain · Sweden Switzerland · Taiwan · Thailand · Turkey · Ukraine · United Kingdom · United States · Venezuela · Vietnam · Zimbabwe                      Copyright  2004 Cisco Systems, Inc. All rights reserved. Cisco, Cisco Systems and the Cisco Systems logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0402R)      204044_ETMG_AE_08.04Printed in the USA