Can't Ping to default router 1

[nvthiem]

Hi experts,

2 Switches ET-MFX12 support RSTP connect to 2 Cisco Switches supported PVST.

after configure in 2 ET-MFX12 with disable RSTP and configure in 2 Cisco switches and Router. from ET-MFX12 can't ping to default router. it have a loop.

then we enable RSTP in 2 ET-MFX12, we still can't ping to default router. all port ET-MFX12 port is forwarding
Remove cable between 2 ET-MFX12 we can ping to default router. we have check port status in ET-MFX12 all port is forwarding.
edge port in 2 ET-MFX12 is configured to do not send BPDU to switch since PVST and RSTP is not compatible

So we think that all port in switches is discarding.

Could you advise me how to configure this scenario? RSTP and PVST ?

Pls see the attached diagram for more detail.
Thank you in advance!

 

[PScottC]

You have to pass the BPDU. Rapid STP is just a variant of STP. PVSTP is simply "per VLAN" STP. You will get a loop if you fail to pass BPDUs between all the switches if you have a redundant connected topology. Enable RSTP on your ET switches and enable Rapid PVST on the Cisco switches. You will also need to pick an appropriate root bridge depending on your anticipated data flow.

PSC
[—] CCNP[sub][blue]x3[/blue][/sub] (Security/R&S/Wireless) [•] MCITP: Enterprise Admin [•] MCSE [—]

Governments and corporations need people like you and me. We are samurai. The keyboard cowboys. And all those other people out there who have no idea what's going on are the cattle. Mooo! --from "Hackers

 

[nvthiem]

You mean that we need to enbable RSTP on ET switches and PVST on the Cisco switches, and choose an appropriate root bridge for all ET switches and Cisco switches, but RSTP and PVST is not compatible each other so can switches understand to avoid this loop topology?

We enabled RSTP in all ET switches and configure edge port for all case(edgePortMode =ADMIN_EDGE_BPDU_FILTER) and edgePortMode = ADMIN_EDGE_OFF to don't include and include Cisco switches in RSTP topology but the problem is still remain unchanged.

Do you have any idea for edgeportmode configuration in Cisco switches?

Thanks !

 

[PScottC]

I'm saying that Rapid STP (RSTP) and Per-Vlan STP (PVST) should not be inconpatible. Don't get caught up in the acronyms. Spanning Tree is Spanning Tree. Compatibility was built into the 802.1q protocols. Your Cisco Switches may be defaulting to ISL on the trunk ports, which is causing communication problems. Make sure to set them to "trunk encapsulation dot1q".

All of your switch to switch links should be trunks, not edge ports.

PSC
[—] CCNP[sub][blue]x3[/blue][/sub] (Security/R&S/Wireless) [•] MCITP: Enterprise Admin [•] MCSE [—]

Governments and corporations need people like you and me. We are samurai. The keyboard cowboys. And all those other people out there who have no idea what's going on are the cattle. Mooo! --from "Hackers

 

[nvthiem]

I got your idea now. Thank you very much PScottC!

 

[nvthiem]

Hi PScottC,

If we configure "trunk encapsulation dot1q" so we need to make sure that the native VLAN matches across the link. by default the native VLAN is 1. so it is access mode?
If we change the native VLAN to be other than VLAN1 we also need to change the native VLAN on the router accordingly? currently we use Vlan id 384 for this traffic, and when change native VLAN, will it effect to other traffic or something else?


By the way, thanks again for your reply above!

 

[PScottC]

Native VLAN determines what the switch does with untagged frames. So if you want untagged frames to be in vlan 14, you would specify that as the native vlan. If you expect a frame to have a 802.1q tag, then that is simply a trunked vlan.

If you've got an uplink from a cisco switch to a cisco router, you usually have to specify which subinterface (on the router) contains the native VLAN, and you typically need to specify it on the switch also.

PSC
[—] CCNP[sub][blue]x3[/blue][/sub] (Security/R&S/Wireless) [•] MCITP: Enterprise Admin [•] MCSE [—]

Governments and corporations need people like you and me. We are samurai. The keyboard cowboys. And all those other people out there who have no idea what's going on are the cattle. Mooo! --from "Hackers

 

[nvthiem]

Thank you so much for you kindly help!

It is very helpful for me.