05-19-2020 07:48 PM
Hello there, i have recently purchased two new Cisco 596T switches to add to our remote datacenter (Remote site). i have two existing 5596T at our HQ site, setup vPC between these two 5596T at the HQ site. now i need to add the two new 5596T to the remote site to connect to the two 5596T switches at HQ Site. i need guidance with configuration to connect the two new 5596T switches to the existing switches at HQ site (see simple diagram below depicting the setup).
HQ Site Remote Site
Switch1 -------------> Switch1
| |
Switch2 ------------->Switch2
Solved! Go to Solution.
05-21-2020 04:23 PM
05-19-2020 08:50 PM
05-19-2020 09:05 PM - edited 05-19-2020 10:45 PM
hi @Francesco Molino thank you very much for your helpful advise. i came across an old post by @aaronanderson on a similar setup and someone posted the solution below. can you advise if that config will work with what i am trying to achieve?
[N5k-1]------[N5k-2]
| \ / |
| \ / |
| /\ |
| / \ |
[N5k-3]------ [N5k-4]
=========== n5k-1 ===========
vpc domain 10
role priority 2000
system-priority 4000
interface port-channel1
description vPC Peer Link
vpc peer-link
interface port-channel2
description vPC link to second N5k pair
vpc 2
interface eth 1/1
description N5k-3 Eth 1/1
channel-group 2 mode active
interface eth 1/2
description N5k-4 Eth 1/1
channel-group 2 mode active
=========== n5k-2 ===========
vpc domain 10
role priority 2100
system-priority 4000
interface port-channel1
description vPC Peer Link
vpc peer-link
interface port-channel2
description vPC link to second N5k pair
vpc 2
interface eth 1/1
description N5k-3 Eth 1/2
channel-group 2 mode active
interface eth 1/2
description N5k-4 Eth 1/2
channel-group 2 mode active
=========== n5k-3 ===========
vpc domain 20
role priority 3000
system-priority 4000
interface port-channel1
description vPC Peer Link
vpc peer-link
interface port-channel2
description vPC link to first N5k pair
vpc 2
interface eth 1/1
description N5k-1 Eth 1/1
channel-group 2 mode active
interface eth 1/2
description N5k-2 Eth 1/1
channel-group 2 mode active
=========== n5k-4 ===========
vpc domain 20
role priority 3100
system-priority 4000
interface port-channel1
description vPC Peer Link
vpc peer-link
interface port-channel2
description vPC link to first N5k pair
vpc 2
interface eth 1/1
description N5k-1 Eth 1/2
channel-group 2 mode active
interface eth 1/2
description N5k-2 Eth 1/2
channel-group 2 mode active
05-20-2020 12:07 AM
Your configuration is ok, it would work as it is.
You might also want to consider the following things for your DCI (if is the case):
For more details about FHRP Isolation I would suggest to read this document:
Stay safe,
Sergiu
05-21-2020 03:37 PM
Thank you very much for your response. I will consider implementing those things (FHRP, STP isolation, broadcast storm control) you mentioned in your response.
05-20-2020 09:57 AM
05-21-2020 03:41 PM
Thank you for your input. Yes i did the setup as per my previous post. below is the vpc config on the new nexus pair
Nexus Switch1
-------------------
vpc domain 10
role priority 17000
system-priority 8192
peer-keepalive destination 172.31.30.32
delay restore 150
ip arp synchronize
Nexus Switch2
-------------------
vpc domain 10
role priority 17100
system-priority 8192
peer-keepalive destination 172.31.30.31
delay restore 150
ip arp synchronize
QUESTION: do i need to also include the command 'peer-switch' in the vpc config or what i have currently is sufficient?
05-21-2020 04:23 PM
05-25-2020 10:56 PM - edited 05-25-2020 11:03 PM
If i can seek your further assistance with another issue i came across while connecting hosts to the nexus. i setup a port with the config below
interface port-channel18
switchport access vlan 206
spanning-tree port type edge
spanning-tree bpduguard enable
spanning-tree bpdufilter enable
vpc 18
interface Ethernet1/44
switchport access vlan 206
spanning-tree port type edge
spanning-tree bpduguard enable
spanning-tree bpdufilter enable
channel-group 18
i use cisco sfp (SFP-10G-SR) and multimode fibre cable to connect a host to the port. when i connect the host to the switch port the port does not come up. i notice that when i remove the command 'channel-group 18' from port eth1/44 the port comes up. why is it behaving this way?
See logs below i get when i added the command 'channel-group 18' to eth1/44 and the port goes down
GOV-PVME-AGSP04(config-if)# 2020 May 26 16:43:21 GOV-PVME-AGSP04 %ETHPORT-5-IF_DOWN_CHANNEL_MEMBERSHIP_UPDATE_IN_PROGRESS: Interface Ethernet1/43 is down (Channel membership update in progress)
2020 May 26 16:43:23 GOV-PVME-AGSP04 last message repeated 1 time
2020 May 26 16:43:23 GOV-PVME-AGSP04 %ETHPORT-5-SPEED: Interface Ethernet1/43, operational speed changed to 10 Gbps
2020 May 26 16:43:23 GOV-PVME-AGSP04 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/43, operational duplex mode changed to Full
2020 May 26 16:43:23 GOV-PVME-AGSP04 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/43, operational Receive Flow Control state changed to off
2020 May 26 16:43:23 GOV-PVME-AGSP04 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/43, operational Transmit Flow Control state changed to off
2020 May 26 16:43:24 GOV-PVME-AGSP04 %ETHPORT-5-SPEED: Interface port-channel19, operational speed changed to 10 Gbps
2020 May 26 16:43:24 GOV-PVME-AGSP04 %ETHPORT-5-IF_DUPLEX: Interface port-channel19, operational duplex mode changed to Full
2020 May 26 16:43:24 GOV-PVME-AGSP04 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface port-channel19, operational Receive Flow Control state changed to off
2020 May 26 16:43:24 GOV-PVME-AGSP04 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface port-channel19, operational Transmit Flow Control state changed to off
05-26-2020 05:39 PM
05-26-2020 06:01 PM
I resolved the issue. the portchannel configuration was not applied to the other pair of Nexus5K yet while i was connecting a host to the other Nexus 5K that already has portchannel configured. i noticed that when i do ran the 'show vpc brief' command and noticed the inconsistency message. i applied the same port-channel configuration on the other pair of nexus 5k and the port came up.
thank you for your assistance though.
05-26-2020 07:36 PM
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