copyright © 2014 emc corporation. all rights reserved. networking features upon completion of this...
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features 1
Networking Features
Upon completion of this module, you should be able to:• Discuss and configure VNX networking features
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features 2
Networking Features
During this lesson the following topics are covered:• Basic network concepts and terminology• VLANs and VLAN tagging• Roles of networking features• Types of virtual devices• Physical, virtual and logical interfaces on a Data Mover
Lesson 1: Networking Features Overview
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Networking Devices Overview
• Ethernet hub (EMC recommends no hubs in VNX environment) Layer 1 All traffic sent to all ports Half duplex mode only
• Ethernet switch Layer 2 Sends traffic to specific port 100Mbps+/Full duplex support
• Managed Ethernet switch Allow control and traffic management Includes features such as Ethernet Channel, LACP and VLANs Can operate at Layer 3
• Infrastructure must support VNX feature
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Virtual Local Area Network (VLANs)
• Groupings of switch ports Divides large number of ports
Confines broadcasts Contributes to security
Can combine physically separate LANs
• A VNX Physical device may be required to participate in multiple network segments VLAN Tagging
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Click icon to add picture• Top diagram illustrates a “public network”
• Bottom diagram illustrates three “private networks”
• Physical location is not relevant to VLAN number
• VLAN numbers are defined by the local administrator
• InterVLAN traffic must be routed
VLANs
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
VLAN Tagging
• A single network interface card can be assigned multiple logical interfacesDifferent VLAN can be assigned to each interfaceDestination IP address must match the interface IP addressThe packet's VLAN tag must match the interface's VLAN ID
• Zero (or blank) is the default value of VLAN ID Packets are sent without tags (default value)
• VLAN Tag (ID)Written by device that transmits the frame
• Switch port settingsType trunkProtocol setting 802.1Q
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Click icon to add picture• Protocol 802.1Q• Individual Ethernet
switch port is classified as a trunk port
• Administrator must allow specific VLANs to use the trunk port
• VLAN tagging is seen in many enterprise networking environments
VLAN Tagging (continued)
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Roles of Networking Features
• High Availability: Ethernet Channel Link aggregation Fail-Safe Network
• Increase Network Flexibility: VLAN Tagging
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Virtual Device Overview and Usage
• Virtual device is a combination of multiple physical devices defined by a single MAC address.
• You cannot individually assign same IP address to different physical devices on a Data Mover Duplicate IP Different MAC addresses
• Virtual devices are used to distribute data among multiple physical ports in case of failure
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Types of VNX Virtual Devices
• Ethernet Channel Dependent on pre-existing Ethernet configuration (customer must
provide)
• Link Aggregation Dependent on pre-existing Ethernet configuration (customer must
provide)
• Fail Safe Network Independent of pre-existing Ethernet configuration Should be configured across two Ethernet switches
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Ethernet Channel and LACP
• Ethernet Channel Static configuration No support for Port Aggregation Protocol (PAgP) Works with Cisco EtherChannel
• Link Aggregation (LACP) Industry standard (802.3ad) alternative to EtherChannel
• Both provide more overall bandwidth than a single port Connection to any single client runs through one physical port, and
is therefore limited by the port’s bandwidth
• When the connection to one port fails, the switch automatically switches traffic to the remaining ports
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Ethernet Channel and LACP Comparison
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Feature Ethernet Channel Link Aggregation
Switch Support
Switch must use IEEE standard, Fast or Gig Ethernet
Switch must support IEEE 802.3ad Link Aggregation
Link Speeds Allows links of different speedsDisables links with a different speed than the majority
Duplex Full or half Full
Number of Ports
2, 4, or 8 2 - 12
Availability
Broken links are physically marked as “up” on the Data Mover, but the switch will detect the down link and redirect traffic to the Data Mover down other links
Better link control: LACPDU frames are transmitted on each link in the aggregation to ensure they are not broken
Misconfiguration Protection
Misconfigured links difficult to detect
Detects misconfigured links and marks them as down
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
VNX Use of Statistical Load Distribution
• Applies for Ethernet Channels and Link Aggregation devices• Three methods of statistical load distribution
MAC address IP address (default) IP address and TCP port
• Port Failure Traffic redirect to live port
• Incoming and outgoing traffic ports may differ
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Fail Safe Network
• Extends link failover by providing switch-level redundancy• A FSN appears as a single link with a single MAC address, and
potentially multiple IP addresses• A FSN is comprised of a physical port, Ethernet Channel, Link
Aggregation or any combination of the three• Only one connection in a FSN is active at a time• There is no requirement that the connections making up a FSN
be the same type, or that the connections be made to the same network switch
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Cross-Stack EtherChannel
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Switch 1
Switch 2
Switch 3
Cross-Stack SwitchesStack A
Cross-Stack EtherChannel
Copyright © 2014 EMC Corporation. All Rights Reserved.
Networking Features
During this lesson the following topics were covered:• Basic network concepts and terminology• VLANs and VLAN tagging• Roles of networking features• Types of virtual devices• Physical, virtual and logical interfaces on a Data Mover
Lesson 1: Summary
Networking Features 16
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features 17
Networking Features
During this lesson the following topics are covered:• Creating an Ethernet Channel device• Creating a LACP device• Creating a FSN device• Creating VLAN IDs on an interface
Lesson 2: Networking Features Configuration
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
VNX Network Terminology Review
• Physical Device (device name) The actual ports on the Data Mover (e.g., cge-1-0, fge-2-3) Not a variable
• Virtual Device (device name) User assigned variable name Combination of multiple physical devices
• Logical Interface (interface name) User/System assigned variable name Assigned an IP address
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Click icon to add picture• The physical port on a Data Mover cge = Copper Gigabit Ethernet fge = Optical Gigabit Ethernet fxg = Optical 10 Gigabit Ethernet
• Not a variable• Can support multiple interfaces/IP
addresses with VLAN Tagging• 10/100/1000 Mbps or 10 Gbps• Half/Full/Auto
Physical Device (device name)
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• No virtual devices in this configuration
• An interface name is created and an IP address is assigned using a physical copper Gigabit Ethernet port on a primary Data Mover
• Other IP addresses can be created on the same physical interface Interface name must differ VLAN Tagging may be required
Physical - Logical (device – interface)
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
• Two physical devices (cge-1-0 and cge-1-1) are used to create a virtual device lacp0 using the LACP Protocol
• An IP address is assigned using the virtual device lacp0
• Other IP address can be created on the same virtual interface interface name must differ VLAN Tagging
Physical - Virtual - Logical
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
• Cannot use physical devices that have previously been used They will not be displayed
• Standby Data Mover(s) will inherit configuration Ethernet switch should be setup
in advance (required for Ethernet Channel and Link Aggregation)
• Primary Variables Data Mover Type
Ethernet Channel Link Aggregation Fail Safe Network
Device Name User must configure
Creating a Virtual Device
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Settings > Network > Settings for File > Devices > Create
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• Settings > Network > Settings for File > Devices (tab) > Create
• Select Data Mover• Select Ethernet Channel• Enter Device Name• Select Ports• Select Speed/Duplex
Should be set to match Ethernet switch settings
Creating an Ethernet Channel Virtual Device
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From Device tab
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• Settings > Network > Settings for File > Devices (tab) > Create
• Select Data Mover• Select Link Aggregation• Enter Device Name• Select ports• Select Speed/Duplex
Should be set to match Ethernet switch settings
Note: cge-1-0 and cge-1-1 are not listed because they are already in use
Creating a Link Aggregation Virtual Device
From Device tab
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
• Settings > Network > Settings for File > Devices (tab) > Create
• Select Data Mover• Select Fail Safe Network • Enter Device Name• Select Devices
Primary (optional) Standby
• Can combine Dissimilar Ethernet devices Virtual and physical devices
Creating a FSN Virtual Device
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From Device tab
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features 26
Click icon to add picture• Primary should be used if members are not equal The primary is a better data
path More reliable Faster
Optional
• Standby Will support failed link Will not fail back when primary
failure is corrected
FSN Role of Primary and Standby
From Device tab
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Click icon to add picture• IP address are assigned to Virtual devices same as Physical devices
• Physical devices used by Virtual devices will not be selectable
• Auto calculating Broadcast Address• Default optional values
Name: The IP address with the value “-” replacing “.” 10.0.0.1 would be 10-0-0-1
MTU: 1500 VLAN ID: 0
Creating a Data Mover Interface
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Click icon to add picture• Settings > Network > Settings for File > Devices
• Right-click on device and select properties for more detail Adjust speed and duplex
Managing Virtual Devices
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Click icon to add picture• Settings → Network → Settings for File → Devices Select item for removal; right
click > select delete, or click on delete button
• Can only delete one virtual device at a time
• Cannot delete devices that have dependencies In use by CIFS server In use by another virtual device Virtual devices must be deleted in
the reverse order from how they were created
Deleting Virtual Devices
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Copyright © 2014 EMC Corporation. All Rights Reserved.
Networking Features
During this lesson the following topics were covered:• Creating an Ethernet Channel device• Creating a LACP device• Creating a FSN device• Creating VLAN IDs on an interface
Lesson 2: Summary
Networking Features 30
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Networking Features
During this lesson the following topics are covered:• Network features to support a complex environment• VNX and Ethernet switch requirements• Active data paths in case of failure• Networking high availability considerations
Lesson 3: Complex Examples and Considerations
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
• Two physical devices (cge-1-0 and cge-1-1) are used to create a virtual device “lacp0” on a Data Mover
• Two physical devices (cge-1-2 and cge-1-3) are used to create another virtual device “lacp1” on a Data Mover
• Both Virtual devices (lacp0,lacp1) are used to create another Virtual device “fsn0”
• An IP address is assigned using the virtual device fsn0
VNX Configuration
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lacp0
lacp1
fsn0
10.127.57.233
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Click icon to add picture• If connection to a single network segment is not enough, use VLAN Tagging
• IP addresses are on different network segments (different VLANs)
• VLAN value provided by Ethernet switch administrator
• Set VLAN ID to match Ethernet switch value
Example: If fsn0 uses all ports and customer needs to connect to multiple network segments, VLAN Tagging should be used
Optional: Creating Multiple Logical Interfaces
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
fsn0
Ethernet Switch Configuration
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lacp0=cge-1-0,cge-1-1 (primary)
Switch
Network
lacp1=cge-1-2,cge-1-3 (secondary)
Switch
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Device
Virtual Device
Status
cge-1-0 lacp
0
fsn0
Active
cge-1-1
Active
cge-1-2 lacp
1
Standby
cge-1-3
Standby
Device
Virtual Device
Status
cge-1-0 lacp
0
fsn0
Off-line
cge-1-1
Active
cge-1-2 lacp
1
Standby
cge-1-3
Standby
Device
Virtual Device
Status
cge-1-0 lacp
0
fsn0
Off-line
cge-1-1
Off-line
cge-1-2 lacp
1
Active
cge-1-3
Active
Device
Virtual Device
Status
cge-1-0 lacp
0
fsn0
Off-line
cge-1-1
Off-line
cge-1-2 lacp
1
Off-line
cge-1-3
Active
Device
Virtual Device
Status
cge-1-0 lacp
0
fsn0
Standby
cge-1-1
Standby
cge-1-2 lacp
1
Active
cge-1-3
Active
Device
Virtual Device
Status
cge-1-0 lacp
0
fsn0
Active
cge-1-1
Active
cge-1-2 lacp
1
Standby
cge-1-3
Standby
Example: Active Data Path
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Phase 1: Normal Operation
Phase 2: Port failure
Phase 3: Port failures
Phase 4: Port failures
Phase 5: Failure resolved (no primary)
Phase 5: Failure resolved (primary=lacp0)
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Speed and Duplex Considerations
• VNX speed and duplex setting must match Ethernet switch• Failure to address has negative results
Failure to connect Performance problems
• Creation of an Ethernet Channel or Link Aggregation device requires user to set speed and duplex (default = 1000 FD)
• An FSN device inherits speed and duplex currently configured on member devices
See Basic Network Configuration module for more information
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Data Mover Failover Network Considerations
• Failed network connections do not trigger Data Mover failover Data Mover is operating normally, network is not
• Standby Data Mover requires identical configuration Any Ethernet Channels or Link Aggregation devices require same
configuration on Ethernet switch Any trunk ports used with VLAN tagging require same
configuration on Ethernet switch
• Test configuration when deploying configuration Incorrect configuration for standby Data Mover could cause service
interruption in failover situation
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Confirming the Ethernet Switch
• Confirm channels have been created (if required) Cisco EtherChannel LACP Typical for EMC personnel not to have access to Ethernet Switch
devices Dependency on customer to provide information
• Confirm trunk ports have been created (if required)• Commands used to create channels are issued on the VNX AND
Ethernet Switch
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Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
LACP Considerations
• A LACP link can be created with any number of physical devices• Only Full Duplex Ethernet ports can be used to create the link
If a mixture of port speeds is given, the Data Mover will choose the greatest number of ports at the same speed
In case of a tie, the fastest ports are chosen
• Although multiple links are joined, no one client will gain an advantage from this configuration with regards to network speed or throughput Link determined by source/destination IP address Can also load balance based on source/destination MAC address
or source/destination IP address AND source/destination TCP/UDP ports
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Copyright © 2014 EMC Corporation. All Rights Reserved.
Networking Features
During this lesson the following topics were covered:• Network features to support a complex environment• VNX and Ethernet switch requirements• Active data paths in case of failure• Networking high availability considerations
Lesson 3: Summary
Networking Features 40
Copyright © 2014 EMC Corporation. All Rights Reserved. Networking Features
Summary
Key points covered in this module:
• Virtual network devices extend fault tolerance into the network by providing port redundancy
• FSN protects against switch failures
• High Availability solution need to include aligned switch port configurations for Primary and Standby Data Movers
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