Using MLAG In Dell Networks
Using MLAG in Dell NetworksA deployment guide for Dell Networking switches (version 1.1)Dell EngineeringMarch 2014January 2014ddvERSIONA Dell Deployment and Configuration Guide
RevisionsDateDescriptionAuthorMarch, 20141.1 includes limitation of partner switches, added clarification oftypes of ports that can be used in peer-links, and changes totopologies supported in new appendix.Victor TeeterJanuary, 20141.0 Initial ReleaseVictor TeeterPAPER IS FOR INFORMATIONAL PURPOSES ONLY, AND MAY CONTAIN TYPOGRAPHICAL ERRORS AND TECHNICALINACCURACIES. THE CONTENT IS PROVIDED AS IS, WITHOUT EXPRESS OR IMPLIED WARRANTIES OF ANY KIND. 2014 Dell Inc. All rights reserved. Reproduction of this material in any manner whatsoever without the express written permissionof Dell Inc. is strictly forbidden. For more information, contact Dell.PRODUCT WARRANTIES APPLICABLE TO THE DELL PRODUCTS DESCRIBED IN THIS DOCUMENT MAY BE FOUND e-commercial-and-public-sector Performance of network referencearchitectures discussed in this document may vary with differing deployment conditions, network loads, and the like. Third partyproducts may be included in reference architectures for the convenience of the reader. Inclusion of such third party products doesnot necessarily constitute Dell’s recommendation of those products. Please consult your Dell representative for additionalinformation.Trademarks used in this text: Dell , the Dell logo, PowerConnect , OpenManage , EqualLogic , Compellent , and Force10 are trademarks of Dell Inc. Other Dell trademarks may be used in this document. Cisco Nexus , Cisco MDS , Cisco NX-0S , and other Cisco Catalyst are registered trademarks of Cisco System Inc. Microsoft , Windows , Windows Server , Internet Explorer , MS-DOS , Windows Vista and Active Directory are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries. Broadcom and NetXtreme are registered trademarks of Broadcom Corporation. Qlogic is aregistered trademark of QLogic Corporation. Other trademarks and trade names may be used in this document to refer to eitherthe entities claiming the marks and/or names or their products and are the property of their respective owners. Dell disclaimsproprietary interest in the marks and names of others.2.Using MLAG in Dell Networks
Table of ContentsRevisions . 2Executive Summary . 41Introduction . 52Caveats for Enabling MLAG . 63Supported Topologies . 84Single-Tier Example . 95Two-Tier Example . 13Appendix . 193.A.1Unsupported Configurations . 19A.2Future support of MLAG with similar technologies . 19A.3Additional Resources . 20Using MLAG in Dell Networks
Executive SummaryMulti-switch Link Aggregation or MLAG is a feature that allows two Dell Networking switches to act as asingle switch, provides multiple paths across the network with benefits like: Failover in cases of failed cables or switchesIncreased bandwidth of up to double the bandwidth of a single switchElimination of port blocking as well as reconvergence delays of spanning treeAn MLAG domain is created by connecting a Dell Networking switch to another Dell Networking switchthrough Peer-Link ports to create MLAG peers (the two connected switches). Other switches directlyconnected to the MLAG peers are unaware that they are connecting to two switches. Two switchesappear as a single switch on the network.All links in the MLAG can carry data traffic across many physically diverse topologies. In the case of a linkor switch failure, traffic continues to flow with minimal disruption. MLAG optimnizes availability andbandwidth between attached devices in Dell’s Datacenter and Campus networking solutions.The following Dell Networking N-series switches support MLAG and may be used in building theconfigurations in this white N4064N2048PN3048N4064FN3048P4.Using MLAG in Dell Networks
1IntroductionMLAGs provide an active-active split aggregation deployment across two switches acting as one. MLAGcreates a more resilient network with higher bandwidth capabilities. This white paper discusses MLAGs,how and when they are used, caveats to look out for, and instructions on how to implement MLAG intoyour network.Figure 1 below shows two very basic examples of MLAG domains. In both examples, peer switches arelinked together with a special LAG (one or more cables as denoted by the red line in the pictures below),called a Peer-Link. Any non-management port on the switch can be used in the Peer-Link. With thePeer-Link configured, the two switches appear as a single switch to partner switches upstream anddownstream. Each partner switch contains MLAGs that are simply LAGs (link aggregation groups) whosecables are split between the two peers. Primary and secondary peer roles are chosen automatically by theprogram when MLAG is enabled.Simple L2 MLAGMLAG domainSecondary MLAG peerPrimary MLAG peerPeer-LinkMLAGMLAG domainappears as a singlelogical switch topartner switches onthe networkPartner SwitchL3 MLAG with mulitplepartner switchesMLAG domainSecondary MLAG peerPrimary MLAG peerPeer-LinkPartner SwitchFigure 15.Using MLAG in Dell NetworksMLAGMLAGTwo examples of a single-tier MLAG topologyPartner Switch
2Caveats for Enabling MLAGThere are a few limitations in implementing MLAGs: Two identical switch models are required to create MLAG peers. This means an N2048 can only bepeered with another N2048, an N3024 with another N3024, and so on.Peer devices must use the same expansion module type if ports from the expansion module are tobe part of the MLAG interface.Neither of the two switches used as MLAG peers may be stacked with other switches.MLAG status using the show vpc brief command is only run from the primary MLAG peerwhen both the primary and secondary peer information is required.See the switch User Guide for additional information.Note: Run the show vpc brief command only from the Primary MLAG peer. This providesinformation on both peer switches.2.1Consistency of MLAG PeersAs mentioned in the section above, the two switches to be used as MLAG peers must be identical models,as well as any expansion module that is used in the MLAG peer-link setup. There are also six areas in thesoftware configuration that must be given special attention to ensure they contain identical informationprior to enabling the MLAG. These areas are reflected in Figure 2.MLAG peerpeerlinkLink Aggregation Spanning TreeMLAG Port-channelsInterfacesVLANsFirmwareFigure 26.Using MLAG in Dell NetworksConsistent MLAG peer configurationsMLAG peerLink AggregationSpanning TreeMLAG Port-channelsInterfacesVLANsFirmware
Change any settings mentioned below on both the MLAG peers when required. Enable MLAG only afterthe above settings are configured on the two peer switches.It is also recommended for MLAG to be temporarily disabled in order to make subsequent changes to theabove settings.Note: Be sure to schedule down time if making changes that impact traffic or cause data loss.Note: Failure to make these areas identical may cause sporadic traffic issues on the network which aredifficult to troubleshoot.Option categorySettings that need to match on both MLAG peersLink AggregationHashing modeMinimum linksStatic/dynamic LAGLACP parameterso Actor parameterso Admin keyo Collector max-delayo Partner tEdgeportRoot guardLoop guardSTP VersionSTP MST VLAN configurationSTP MST instance configuration (instance ID,port priority, port cost/mode)Port-channel modeLink speedDuplex modeMTUBandwidthVLAN configurationPFC configurationCoS queue assignmentsMLAG VLANs must be configured on bothMLAG peers, and connect to two partner LAGs.Both peers require the same firmware versionto operate correctly.FDB entry aging timersStatic MAC entriesACL configurationSpanning Tree1.MLAG Port-channelsInterfacesVLANsFirmwareMisc.Table 17.Using MLAG in Dell NetworksSpecific configuration options to be equal among MLAG peers
3Supported TopologiesMLAG topologies contain several options. They can be a single layer (only one pair of MLAG peer switches)or two layers (two pair of MLAG peer switches). The peer-link between peers can have anywhere from 1to 8 active interfaces to create the link. With these and other variables, there are dozens of ways to setupan MLAG. Table 2 lists all supported topology options.Topological parameterSupported options# of MLAG domains per switch# of peer switches per MLAG domain# of interfaces per MLAG# of interfaces per Peer-Link# of MLAGs connecting to MLAG domain# of layersTable 2 Parameters for an MLAG topology122 to 81 to 8Limited only by number of ports available1 or 2Figure 3 shows just a few examples of MLAG topologies that can be built using the MLAG feature. The redlines show the peer-lnks between the primary and secondary peer switches.3 partner switches1 partner switch2 tier(2 layer, full mesh)2 partner switchesSYS MASTERFAN PSUForce10 S4810PRS-23252024681012141618202224SFP 262830323436384042444648QSFP 6056LNKETHERNETVLTiACTSYS MASTERFAN PSUForce10 S4810PRS-232520246Figure 38.Using MLAG in Dell NetworksExamples of MLAG topologies81012141618202224SFP VLTi262830323436384042444648QSFP 6056LNKETHERNETACT2 layer (MLAG and VLT)
4Single-Tier ExampleThis example shows the configuration of the two MLAG peers with two MLAG partners. The defaultspanning tree configuration is used and spanning tree is disabled on the peer link.Primary MLAG peer(27)(1/0/1)Peer-Link(48)N3048Partner Switch A(47)MLAGSecondary MLAG peer(12)N3048MLAG(29)(1/0/1)Partner Switch B(30)(28)Figure 4(11)Single tier MLAG topologyTo configure the two MLAG peers in the basic configuration, follow the steps below:1.9.Enter the following commands on both peer switches before enabling MLAG (usingthe feature vpc command) on each one. Each column below contains commandsthat can be cut and pasted into a CLI session.Primary MLAG Peer (N3048)Secondary MLAG Peer N3048)Description of commandsconfigurevlan 30exitconfigurevlan 30exit Create a VLAN for MLAG and allpartner trafficinterface port-channel 1description "MLAG-Peer-Link"spanning-tree disableswitchport mode trunkvpc peer-linkexitinterface port-channel 1description "MLAG-Peer-Link"spanning-tree disableswitchport mode trunkvpc peer-linkexit Configure the port channel forthe peer link- must be trunk modeinterface tengigabitethernet 1/0/1channel-group 1 mode activedescription "MLAG-Peer-Link"exitinterface tengigabitethernet 1/0/1channel-group 1 mode activedescription "MLAG-Peer-Link"exit Identify and configure the peerlink interfaceinterface port-channel 30switchport mode trunkinterface port-channel 30switchport mode trunk Create a LAG for partner switchA to pass trafficUsing MLAG in Dell Networks
10.Primary MLAG Peer (N3048)Secondary MLAG Peer N3048)switchport trunk native vlan 30vpc 30exitswitchport trunk native vlan 30vpc 30exitinterface port-channel 40switchport mode trunkswitchport trunk native vlan 30vpc 40exitinterface port-channel 40switchport mode trunkswitchport trunk native vlan 30vpc 40exit Create a LAG (port-channel) forpartner switch B to pass trafficinterface gigabitethernet 1/0/47channel-group 30 mode activedescription "MLAG-Partner-link"exitinterface gigabitethernet 1/0/11channel-group 30 mode activedescription "MLAG-Partner-Link"exit Assign interfaces to connect topartner A LAG (channel-group)interface gigabitethernet 1/0/48channel-group 40 mode activedescription "MLAG-Partner-Link"exitinterface gigabitethernet 1/0/12channel-group 40 mode activedescription "MLAG-Partner-Link"exit Assign interfaces to connect topartner B LAG (channel-group)interface range gi1/0/xx-yyswitchport mode accessswitchport access vlan 30exitinterface range gi1/0/xx-yyswitchport mode accessswitchport access vlan 30exit Assign additional ports to theVLAN only for hosts that will beusing the MLAGfeature vpcvpc domain 1peer-keepalive enableexitfeature vpcvpc domain 1peer-keepalive enableexit Enable the MLAGPartner Switch APartner Switch BDescription of commandsconfigurevlan 30exitconfigurevlan 30exit create same VLAN on partnersinterface port-channel 1switchport mode trunkswitchport trunk native vlan 30exitinterface port-channel 1switchport mode trunkswitchport trunk native vlan 30exit configure the port channeltrunk for the partner linkinterface gi1/0/27channel-group 1 mode activeexitinterface gi1/0/29channel-group 1 mode activeexit Assign interfaces to MLAG(channel-group)interface gi1/0/28channel-group 1 mode activeexitinterface gi1/0/30channel-group 1 mode activeexit Assign interfaces to MLAG(channel-group)interface range gi1/0/xx-yyswitchport mode accessswitchport access vlan 30exitinterface range gi1/0/xx-yyswitchport mode accessswitchport access vlan 30exit Assign additional ports to theVLAN only for hosts that will beusing the MLAGUsing MLAG in Dell NetworksDescription of commands Must use a native VLAN Assign a unique id for partnerswitch A Assign a unique id for partnerswitch B
Note: Interfaces used to connect each peer to the partner switch LAG do not need to match on eachpeer. For instance, in the example above, one partner LAG interface connects to 1/0/47 on the primarypeer while the other interface connects to 1/0/11 on the secondary peer.2. Connect all cables as shown in Figure 4.3. Run the show vpc brief command on either of the two MLAG peers to see whichpeer is the primary MLAG peer.4. Run the show vpc brief command again from the primary switch to display allinformation for both peers.Note: The partner switches must be configured with MLAGs and connected to the MLAG peers, or the“Number of VPCs operational” in the show vpc brief command shows 0.Primary MLAG Peershow vpc briefVPC admin status. EnabledKeep-alive admin status. EnabledVPC operational status. EnabledSelf role. SecondaryPeer role. PrimaryPeer detection admin status. DisabledPeer-Link details----------------Interface. Po1Peer-link admin status. EnabledPeer-link STP admin status. DisabledConfigured VLANs. 1,30Egress tagged VLANs. 30Peer-Link details----------------Interface. Po1Peer-link admin status. EnabledPeer-link STP admin status. DisabledConfigured VLANs. 1,30Egress tagged VLANs. 30VPC Details----------Number of VPCs configured. 2Number of VPCs operational. 2VPC Details----------Number of VPCs configured. 2Number of VPCs operational. 2VPC id# 30----------Interface. Po30Configured VLANs. 1,30VPC interface state. ActiveVPC id# 30----------Interface. Po30Configured VLANs. 1,30VPC interface state. ActiveLocal Members----------------Gi1/0/47Status-----UpLocal Members----------------Gi1/0/11Peer Members---------------Gi1/0/11Status-----UpPeer MembersStatus---------------- ----- * run command from Primary for this information VPC id# 4011.Secondary MLAG Peershow vpc briefVPC admin status. EnabledKeep-alive admin status. EnabledVPC operational status. EnabledSelf role. PrimaryPeer role. SecondaryPeer detection admin status. DisabledUsing MLAG in Dell NetworksVPC id# 40Status-----Up
Primary MLAG PeerSecondary MLAG Peer----------Interface. Po40Configured VLANs. 1,30VPC interface state. Active----------Interface. Po40Configured VLANs. 1,30VPC interface state. ActiveLocal Members----------------Gi1/0/48Status-----UpLocal Members----------------Gi1/0/12Peer Members---------------Gi1/0/12Status-----UpPeer MembersStatus---------------- ----- * run command from Primary for this information Status-----UpNote: Running the show vpc brief command on the primary shows the complete status of both peerswitches. Running the show vpc brief command on the secondary only shows the status of thesecondary.Results of the command should be the same as shown above. All member ports must show “UP”, and the“VPC interface state” must show “Active”. The show interface port-channel is another helpful tool tolet you know if the configured LAG ports are up and running. This command can be run on both theprimary and secondary peers on a single layer MLAG topology. If correctly configured, the port(s) in theLAG are listed with an Active status. If there are any inactive ports, check for cabling or configurationissues.Single-tier MLAG Peershow interface port-channel 40Channel PortsCh-Type Hash Type Min-links Local Prf------- ----------------------------- -------- --------- --------- ---Po40Active: Gi1/0/48Dynamic 71DisabledHash Algorithm Type1 - Source MAC, VLAN, EtherType, source module and port Id2 - Destination MAC, VLAN, EtherType, source module and port Id3 - Source IP and source TCP/UDP port4 - Destination IP and destination TCP/UDP port5 - Source/Destination MAC, VLAN, EtherType, source MODID/port6 - Source/Destination IP and source/destination TCP/UDP port7 - Enhanced hashing mode12.Using MLAG in Dell Networks
5Two-Tier ExampleFigure 5 shows a logical topology for a 2-tier fully meshed MLAG, offering full redundancy across all fourMLAG peers. Six Dell N3024s are used for the example, however the same principals apply and the samecommands can be used on the N2000 and
interface port-channel 1 description "MLAG-Peer-Link" spanning-tree disable switchport mode trunk vpc peer-link exit interface tengigabitethernet 1/0/1 channel-group 1 mode active description "MLAG-Peer-Link" exit interface port-channel 30 switchport mode trunk Create a VLAN for MLAG and all partne
CUMULUS NETWORKS — NETWORKING TERMINOLOGY CHEAT SHEET Common Host to ToR Network Types MLAG leaf01 server01 bridge bridge swp1 swp1 eth1 eth2 swp49-50 leaf02 MLAG is when two switches can create a single LACP bond despite coming from two independent devices. V
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