[j-nsp] EX4500 and Nexus 5K STP

[Alex Martino via juniper-nsp]

Hi All,

I have to connect two Juniper EX4500 (in VC) to Cisco Nexus 5K VPC (two) and they currently run with RSTP+ and many many VLANs. Uplink ports will be ae on Juniper side and PO on Cisco side.

The documentations and forums aren't clear to me about the fact that VSTP is sufficent for clean interop or if I also need RSTP enabled and the native vlan id configured the uplink to handle STP on the Cisco native vlan 1.

Experience and insights are highly appreciated.

Thanks,
Alex
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[David Kotlerewsky]

VSTP requires RSTP, see this note:

Note: EX Series switches can have a maximum of 253 VLANs on VSTP. Therefore, to have as many spanning-tree protocol VLANs as possible, use both VSTP and RSTP. RSTP will then be applied to VLANs that exceed the limit for VSTP. Because RSTP is enabled by default, you just need to additionally enable VSTP.

See the whole article and guide here:

https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/spanning-trees-vstp-ex-series-cli.html

Sincerely,

--DK

On 6/11/18, 4:53 PM, "juniper-nsp on behalf of Alex Martino via juniper-nsp" <juniper-nsp-***@puck.nether.net on behalf of juniper-***@puck.nether.net> wrote:

Hi All,

I have to connect two Juniper EX4500 (in VC) to Cisco Nexus 5K VPC (two) and they currently run with RSTP+ and many many VLANs. Uplink ports will be ae on Juniper side and PO on Cisco side.

The documentations and forums aren't clear to me about the fact that VSTP is sufficent for clean interop or if I also need RSTP enabled and the native vlan id configured the uplink to handle STP on the Cisco native vlan 1.

Experience and insights are highly appreciated.

Thanks,
Alex
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[Alex Martino via juniper-nsp]

I don't want to abuse your kindness David, but how would you technically configure both VSTP and RSTP?

I can't seem to find any sample configuration where both VSTP and RSTP are concurrently configured together and no documentation show any example, not even the link your attached.

This is a bit confusing for me as I am in new areas and I would like to avoid breaking the network when I connect with my less-than-tested configuration.

Thanks,
Alex

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

Post by David Kotlerewsky
Note: EX Series switches can have a maximum of 253 VLANs on VSTP. Therefore, to have as many spanning-tree protocol VLANs as possible, use both VSTP and RSTP. RSTP will then be applied to VLANs that exceed the limit for VSTP. Because RSTP is enabled by default, you just need to additionally enable VSTP.
https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/spanning-trees-vstp-ex-series-cli.html
Sincerely,
--DK
Hi All,
I have to connect two Juniper EX4500 (in VC) to Cisco Nexus 5K VPC (two) and they currently run with RSTP+ and many many VLANs. Uplink ports will be ae on Juniper side and PO on Cisco side.
The documentations and forums aren't clear to me about the fact that VSTP is sufficent for clean interop or if I also need RSTP enabled and the native vlan id configured the uplink to handle STP on the Cisco native vlan 1.
Experience and insights are highly appreciated.
Thanks,
Alex
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https://puck.nether.net/mailman/listinfo/juniper-nsp

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