{"id":1353,"date":"2023-06-25T02:06:05","date_gmt":"2023-06-24T18:06:05","guid":{"rendered":"\/?p=1353"},"modified":"2023-06-25T02:06:05","modified_gmt":"2023-06-24T18:06:05","slug":"configuring-stp-interoperability-between-dell-and-cisco-switches","status":"publish","type":"post","link":"https:\/\/www.insecurewi.re\/index.php\/2023\/06\/25\/configuring-stp-interoperability-between-dell-and-cisco-switches\/","title":{"rendered":"Configuring STP interoperability between Dell and Cisco Switches"},"content":{"rendered":"

Consider the following network diagram:
\n\"\"
\n– Dell OS10 Cores in VLT mode.
\n– Cisco Switches running IOS-V
\n– A vLT trunk to the Cisco access switch nammed “Office”
\n– A standard dot1q trunk to a Cisco access switch named “Factory”
\n– Dell side is running RSTP and the Cisco side PVST+
\n– In the above example the Factory is a single trunk to test the interoperability without VLT.
\n– In the real world this was experienced with Dell S4112F-ON running OS 10 and Cisco 3850s running IOS-XE.
\n– The above scenario is a recreation in GNS3<\/p>\n

We have a problem here. Cisco side sends BPDU to specific multicast address which the Dell switch cannot respond to. Meaning nothing but vlan 1 traffic would pass. This is mentioned in the Dell Networking Cisco Spanning Tree Interopability guide here<\/a><\/p>\n

With RSTP, a direct message exchange takes place between point to point links. This exchange
\nconsists of an RSTP BPDU proposal message and an agreement message. With RPVST+, the same
\nmessage exchange takes place; however, these messages are being generated on a per-vlan basis.
\nRPVST+ is a Cisco proprietary implementation and the way it works, is by generating and sending
\nthese exchange messages to a specific multicast address for any other vlan other
\nthan vlan 1, and this multicast address is understood *only* by the Cisco switch.<\/p><\/blockquote>\n

The easiest way to fix this is to use a native vlan ID other than 1, for example 100. There is no need to add the native VLAN to the allow list on the Dell OS10 side as it is implictly alloed by default. On the Cisco side it must be allowed.
\n1. Set spanning tree priority for vlans on Dell Core 1:
\nspanning-tree vlan 1-3,100,550,824 priority 4096<\/code>
\n2. Set spanning tree priority on Dell Core 2:
\nspanning-tree vlan 1-3,100,550,824 priority 8192<\/code>
\n3. Add a Native VLAN and set it on the link to Factory and Office Cisco switches:
\ninterface vlan100
\n description NATIVE
\n no shutdown
\ninterface port-channel10
\n no shutdown
\n switchport mode trunk
\n switchport access vlan 100
\n switchport trunk allowed vlan 2-3,550
\n vlt-port-channel 10
\n!
\ninterface ethernet1\/1\/1
\n description Link-1-to-Office
\n no shutdown
\n channel-group 10 mode active
\n no switchport
\n flowcontrol receive on
\n!
\ninterface ethernet1\/1\/5
\n description Link-to-Factory
\n no shutdown
\n switchport mode trunk
\n switchport access vlan 100
\n switchport trunk allowed vlan 2-3,550,824
\n flowcontrol receive on<\/code>
\n4. Do the same on the Dell Core 2 side. Now set the Cisco side for Factory and Office switches.
\nOffice:<\/strong>
\nspanning-tree mode rapid-pvst
\nspanning-tree vlan 1-3,100,550 priority 61440
\ninterface Port-channel10
\n description Link to VLT
\n switchport trunk encapsulation dot1q
\n switchport trunk native vlan 100
\n switchport mode trunk
\n!
\ninterface GigabitEthernet0\/0
\n description Link to Core-1
\n switchport trunk encapsulation dot1q
\n switchport trunk native vlan 100
\n switchport mode trunk
\n negotiation auto
\n channel-group 10 mode active
\n!
\ninterface GigabitEthernet0\/1
\n description Link to Core-2
\n switchport trunk encapsulation dot1q
\n switchport trunk native vlan 100
\n switchport mode trunk
\n negotiation auto
\n channel-group 10 mode active<\/code>
\nFactory:<\/strong>
\nspanning-tree mode rapid-pvst
\nspanning-tree vlan 100,550,824 priority 61440
\n!
\ninterface GigabitEthernet1\/1
\n switchport trunk allowed vlan 2,3,100,550,824
\n switchport trunk encapsulation dot1q
\n switchport trunk native vlan 100
\n switchport mode trunk<\/code><\/p>\n

5. Ok sweet, lets verify:
\nCore-1:<\/strong>
\nCore-1# show spanning-tree vlan 100
\nSpanning tree enabled protocol rapid-pvst with force-version rstp
\nVLAN 100
\nExecuting IEEE compatible Spanning Tree Protocol
\nRoot ID Priority 4196, Address 0cea.7b2e.0000<\/strong>
\nRoot Bridge hello time 2, max age 20, forward delay 15
\nBridge ID Priority 4196, Address 0cea.7b2e.0000
\nWe are the root of VLAN 100<\/strong>
\nConfigured hello time 2, max age 20, forward delay 15
\nFlush Interval 200 centi-sec, Flush Invocations 14
\nFlush Indication threshold 5<\/p>\n

Core-2:<\/strong>
\nCore-2# show spanning-tree vlan 100
\nSpanning tree enabled protocol rapid-pvst with force-version rstp
\nVLAN 100
\nExecuting IEEE compatible Spanning Tree Protocol
\nRoot ID Priority 4196, Address 0cea.7b2e.0000<\/strong>
\nRoot Bridge hello time 2, max age 20, forward delay 15
\nBridge ID Priority 8292, Address 0c47.b9db.0000
\nConfigured hello time 2, max age 20, forward delay 15
\nFlush Interval 200 centi-sec, Flush Invocations 2
\nFlush Indication threshold 5
\nInterface Designated
\nName PortID Prio Cost Sts Cost Bridge ID PortID
\n——————————————————————————————————-
\nport-channel10 128.2674 128 1000000 FWD 1 8292 0c47.b9db.0000 128.2674
\nInterface
\nName Role PortID Prio Cost Sts Cost Link-type Edge
\n——————————————————————————————————-
\nport-channel10 Desg 128.2674 128 1000000 FWD 1 AUTO No<\/p>\n

Office:<\/strong>
\nOffice#show spanning-tree summary
\nSwitch is in rapid-pvst mode
\nRoot bridge for: none<\/p>\n

Office#show spanning-tree vlan 100<\/p>\n

VLAN0100
\n Spanning tree enabled protocol rstp
\n Root ID Priority 4196
\n Address 0cea.7b2e.0000<\/strong>
\n Cost 3
\n Port 65 (Port-channel10)
\n Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec<\/p>\n

Bridge ID Priority 32868 (priority 32768 sys-id-ext 100)
\n Address 0cd2.4419.0000
\n Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
\n Aging Time 300 sec<\/p>\n

Interface Role Sts Cost Prio.Nbr Type
\n——————- —- — ——— ——– ——————————–
\nPo10 Root FWD 3 128.65 P2p<\/p>\n

Factory:<\/strong>
\nFactory#show spanning-tree summary
\nSwitch is in rapid-pvst mode
\nRoot bridge for: none
\n!
\nFactory#show spanning-tree vlan 100
\nVLAN0100
\n Spanning tree enabled protocol rstp
\n Root ID Priority 4196
\n Address 0cea.7b2e.0000<\/strong>
\n Cost 4
\n Port 6 (GigabitEthernet1\/1)
\n Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec<\/p>\n

Bridge ID Priority 61540 (priority 61440 sys-id-ext 100)
\n Address 0c7f.b632.0000
\n Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
\n Aging Time 300 sec<\/p>\n

Interface Role Sts Cost Prio.Nbr Type
\n——————- —- — ——— ——– ——————————–
\nGi1\/1 Root FWD 4 128.6 P2p<\/p>\n

As you can see the stp instances on both vendors are converged, the above verification depicts the native vlan 100 is root on Dell-Core-1 (0cea.7b2e.0000).
\nAs soon as vlan 1 was no longer the native vlan id for stp bpdu exchange, everything works as it should. <\/p>\n

I hope this helps anyone else trying to configure Dell OS 10 to Cisco IOS-XE STP.<\/p>\n","protected":false},"excerpt":{"rendered":"

Consider the following network diagram: – Dell OS10 Cores in VLT mode. – Cisco Switches running IOS-V – A vLT trunk to the Cisco access…<\/p>\n","protected":false},"author":2,"featured_media":1386,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24,26,12],"tags":[67,76,87,153,171,173,197],"class_list":["post-1353","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cisco","category-dell","category-switching","tag-cisco","tag-convergence","tag-dell","tag-rapid-pvst","tag-stp","tag-switching","tag-vlan"],"acf":[],"yoast_head":"\nConfiguring STP interoperability between Dell and Cisco Switches - Insecure Wire<\/title>\n<meta name=\"description\" content=\"Configuring STP interoperability between Dell and Cisco Switches\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.insecurewi.re\/index.php\/2023\/06\/25\/configuring-stp-interoperability-between-dell-and-cisco-switches\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Configuring STP interoperability between Dell and Cisco Switches - 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