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A Dell Deployment and Configuration Guide U s i n g M L A G i n D e l l N e t w o r k s A deployment guide for Dell Netw orking switch es Victor Teeter Dell Engineering January 2014 January 2014[...]
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2 U s i n g M L A G i n D e l l N e t w o r k s . Revisions Date Description January, 2014 Initial Release PAPER IS FOR INF ORMATIONAL PURPOS ES ONLY, A ND MAY CONTAI N TYPOGRAPHIC AL ERRORS AN D TECHNICAL INACCURACIES. THE CONTENT IS PR OVIDED AS IS, WI THOUT EXPRESS OR IM PLIED WARRA NTIES OF ANY KI ND. © 2014 Dell Inc . All rights reserve d. Re[...]
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3 U s i n g M L A G i n D e l l N e t w o r k s . Table of Contents Revisions ............................................................................................................................................................................................. 2 Executive Summar y .............................................................[...]
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4 U s i n g M L A G i n D e l l N e t w o r k s . Executive Summary Multi-switch Link Aggregation or MLAG is a feature that allows t wo Dell Network ing switches to act as a single switch, provid es multipl e paths across the netw ork with benefits like : Failover in cases of failed cables or switches Increased bandwidth of up to doub le th[...]
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5 U s i n g M L A G i n D e l l N e t w o r k s . 1 Introduction MLAGs provide an active-active split aggregation depl oyment across two switches acting as o ne. MLAG creates a more resilie nt network with higher ba ndwidth capab ilities . This white paper discusses MLAGs , how and when they are us ed, caveats to loo k out for, and instructions on [...]
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6 U s i n g M L A G i n D e l l N e t w o r k s . 2 Caveats for Enabling MLAG There are a few limitations in impleme nting MLAGs : Two identical s witch models are required to create MLAG peer s . This means an N2048 can only be peered with another N2048, a n N3024 with anot her N3024 , and so on . Peer devices must use the same exp ansion [...]
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7 U s i n g M L A G i n D e l l N e t w o r k s . Change any setti ngs mentioned below on both the MLA G peers when requir ed . E nable MLAG only after the above settings are conf igured on the two peer switches . It is also recommended f or MLAG to be t emporarily di sabled in order to make subsequ ent changes to the above settings. Note : Be sure[...]
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8 U s i n g M L A G i n D e l l N e t w o r k s . 3 Supported Topologies MLAGs topologies contain several options. T hey can be a single layer (only one pair of MLAG peer switches) or two layer s (two pair of MLAG peer switches) . Each MLAG doma in can have anywhere from 1 to 8 partner switc hes . The peer -l ink between peers can have anywhere fro[...]
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9 U s i n g M L A G i n D e l l N e t w o r k s . 4 Single-Tier Example This example sho ws the configuration of the two ML AG peers with t wo MLAG partner s. The default spanning tree configurat ion is used a nd spanning tre e is disabled on the peer link . MLAG MLAG Secondary MLAG peer Peer-Link Primary MLAG peer Partner Switch B Partner Switch A[...]
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10 U s i n g M L A G i n D e l l N e t w o r k s . Primary MLAG Pe er (N3048) Secondary MLAG Peer N3048) Description of commands switchport trunk native vlan 30 vpc 30 exit interface port-channel 40 switchport mode trunk switchport trunk native vlan 30 vpc 40 exit interface gigabitethernet 1/0/47 channel-group 30 mode active description "MLAG-[...]
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11 U s i n g M L A G i n D e l l N e t w o r k s . Note : Interfaces used to connect each peer to the par tner switch LAG do not need to match on each peer . For instance, in the exampl e above, one p artner LAG interf ace connects to 1/0/47 on the primary peer while the other inter face connects to 1/ 0/11 on the secondar y peer. 2. Connect all ca[...]
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12 U s i n g M L A G i n D e l l N e t w o r k s . Primary MLAG Pe er Secondary MLAG Peer ----------- Interface.............................................. Po40 Configured VLANs........................ .. .. 1,30 VPC interface state........................... Active Local Members Status ----------------- ------ Gi1/0/ 48 Up Peer Members Status --[...]
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13 U s i n g M L A G i n D e l l N e t w o r k s . 5 Two -Tier Example Figure 5 shows a l ogical topol ogy for a 2-tier fully meshed ML AG, off ering full redundanc y across all four MLAG peers . Six Dell N3 024s are used for the exampl e, however the same princ ipals apply and the same commands can be used o n the N2000 and N4000 s eries switches [...]
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14 U s i n g M L A G i n D e l l N e t w o r k s . In a full mesh, a ll eight ports joined togeth er in the MLAG (fo ur blue cables) are in the same port c hannel to achieve maximu m redundanc y. To configure the 2- tier in a full mesh configu ration, f ollow the steps belo w: 1. Enter the commands b elow for each co rresponding switch in the topol[...]
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15 U s i n g M L A G i n D e l l N e t w o r k s . MLAG Peer B MLAG Peer C Description of commands interface gigabitethernet 1/0/1 channel-group 40 mode active description "MLAG-Partner-Link" exit interface gigabitethernet 1/0/2 channel-group 40 mode active description "MLAG-Partner-Link" exit interface gigabitethernet 1/0/14 ch[...]
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16 U s i n g M L A G i n D e l l N e t w o r k s . MLAG Peer D MLAG Peer E Description of commands description "MLAG-Partner-Link" exit interface gigabitethernet 1/0/2 channel-group 40 mode active description "MLAG-Partner-Link" exit interface gigabitethernet 1/0/14 channel-group 60 mode active switchport mode trunk switchport t[...]
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17 U s i n g M L A G i n D e l l N e t w o r k s . Note : Interfaces used to connect each peer to the par tner switch LAG do not need to match on each peer . For instance, in the exampl e above, one p artner LAG interf ace connects to 1/0/47 on the primary peer while the other interface connects to 1/0/11 on the seco ndary peer. Note : The partner [...]
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18 U s i n g M L A G i n D e l l N e t w o r k s . Local Members Status ----------------- ------ Gi1/0/14 Up Peer Members Status ---------------- ------ Gi1/0/13 Up Local Members Status ----------------- ------ Gi1/0/13 Up Peer Members Status ---------------- ------ < * run command from Primary for this information > Note : Running the show v[...]
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19 U s i n g M L A G i n D e l l N e t w o r k s . 6 Using MLAG with VLT or Cisco v PC MLAG can also be used in conjuction with similar technologies su ch as Dell Networking VLT or Cisco v PC (virtual port-chan nel), but only in a multi-lay er topolo gy . VLT provides the equ ivalent results as MLA G, but is available on the FTOS -based Dell Networ[...]
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20 U s i n g M L A G i n D e l l N e t w o r k s . In Figure 9 belo w, the first topo logy shows MLAG peers on one la yer and Dell VLT peer s on the second layer, with a full -mesh LAG . Th e second topol ogy shows MLAG peers on o ne layer and Cisco vPC (or Cisco VSS) on the second layer, also with a full -mesh LAG . Neither full mesh conf iguratio[...]
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21 U s i n g M L A G i n D e l l N e t w o r k s . A Additional Resources Support.dell. com is focused on meeting your needs with proven services and suppo rt. DellTechCenter.com is an IT Community wh ere you can connect wit h Dell Custo mers and Dell employees for the purpos e of sharing kno wledge, best p ractices, and informat ion about Dell pro[...]
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22 U s i n g M L A G i n D e l l N e t w o r k s . B Configuration details This paper was compiled using the fol lowing compo nents and versions. Component Description Dell Networking firm ware ver sions D.9.29.2, 6.0.0.2, 6.0.0.4 Switch Dell Networking N2000, N3000, a nd N4000 series A b o u t D e l l Dell is a worldwide lea der in data center and[...]