IBM V29 User Manual
How to Migrate to the z/VM Virtual Switch
Session V29
Alan Altmark, IBM
z/VM Development, Endicott, NY
© 2006 IBM Corporation
IBM Systems
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Note
References to IBM products, programs, or services do not imply that IBM
intends to make these available in all countries in which IBM operates. Any
reference to an IBM product, program, or service is not intended to state or
imply that only IBM's product, program, or service may be used. Any
functionally equivalent product, program, or service that does not infringe
on any of the intellectual property rights of IBM may be used instead. The
evaluation and verification of operation in conjunction with other products,
except those expressly designed by IBM, are the responsibility of the user.
The following terms are trademarks of the International Business Machines
Corporation in the United States or other countries or both:
IBM IBM logo z/VM
Other company, product, and service names may be trademarks or service
marks of others.
© Copyright 2006 by International Business Machines Corporation
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Topics
Routing vs. Bridging
What’s a switch?
VLAN-unaware migration
IBM Systems
VLAN-aware migration
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Review: Guest LAN vs. Virtual Switch
Guest LAN
Guest
Guest
Guest
Virtual router is required
Different subnet
External router awareness
Ethernet LAN
Guest
No virtual router
Same subnet
Transparent bridge
Guest
Virtual Switch
Guest-managed failover
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CP-managed failover
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A routed Guest LAN
web web
web
web
Subnet B
Router
OSA
Subnet A
Virtual router to
connect Guest LAN
to Ethernet
Often VM TCP/IP
z/VM
Switch
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IBM Systems
A bridged Guest LAN using VSWITCH
web web
web
web
Subnet B
OSA
Subnet B
No virtual router
required
Built-in transparent
bridge
z/VM
Switch
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IBM Systems
What’s a switch?
©Cisco Corp
A box that creates a LAN
It can be remotely configured
E.g. Turn ports on and off
Contains a built-in router
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Switch functions
Enable and disable a port
Set port type: trunk or access
Assign port to one or more VLANs
Set port speed: 10 / 100 / 1000 / Auto
Set port duplex mode: Simplex / Duplex / Auto
Define an internal router
Define SNAP (sniffer) ports
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A routed Guest LAN
web web
web
10.0.1 / 24
10.0.1 / 24
web
10.0.1.254
Router
20.17.19.85
OSA
20.17.19.254
20.17.19 / 24
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Default gateway for Guest LAN hosts
z/VM
Default gateway for VSWITCH hosts
Switch
© 2006 IBM Corporation
IBM Systems
z/VM Virtual Switch – VLAN unaware
Linux VM TCP/IP VSE z/OS
Virtual Switch Guest LAN
Virtual QDIO
adapter
CP
Ethernet LAN
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LAN Bridge
OSA-Express
Same LAN
segment and
subnet
© 2006 IBM Corporation
IBM Systems
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Current Cisco 6509 Switch Configuration
OSA is plugged into port 7 of slot 2
Port is defined as an access port
VLAN unaware host
Port is currently assigned to VLAN 201
While in ENABLE mode:
#set vlan 201 name vlan201 mtu 1500
#set vlan 201 2/7
While in CONFIG mode:
#interface vlan 201
#ip address 20.17.19.254 255.255.255.0
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