Cisco switch with Hirschman switch

[Shani444]

Hi Friends,

i have cisco i5000 working as L3 intervlan routing at core layer and on distribution layer i have Hirschman switches. The problem is that, on distribution hirschman switches running  MRP with access switches and RSTP with I5000. So i am receiving port flapping on cisco switch and and only vlan 1 selecting root as hirschman, rest of vlan still selecting cisco

as root. although cisco RSTP priority is default.

[Georg Pauwen]

Hello,

are you running RSTP on the devices in the MRP ring as well ? If not, is that an option in your topology ? Check the requirements for such a setup in the link below:

https://hirschmann-support.belden.com/en/kb/articles/what-are-the-requirements-for-rstp-over-mrp-to-work-correctly

[shan44415]

yes my edge switches connected with cisco switches running MRP.

1  HM switch 1  port 1 & 10 connected with MRP and port 6 is connected with cisco switch. this switch performing as a Ring manager for HM switches.

2 HM switch2 port 1 & 10 are in MRP connected back to back with HM switches. and port 6 is connected with cisco switch.

[shan44415]

Here is my test topology.

[paul driver]

Hello

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@Shani444 wrote:

Hi Friends,

i have cisco i5000 working as L3 intervlan routing at core layer and on distribution layer i have Hirschman switches. The problem is that, on distribution hirschman switches running  MRP with access switches and RSTP with I5000. So i am receiving port flapping on cisco switch and and only vlan 1 selecting root as hirschman, rest of vlan still selecting cisco

as root. although cisco RSTP priority is default.

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Cisco rstp and IEEE rstp should be compatible however i guess you cannot rule out stp incompatibility with Cisco and the Hirscham switches

Is this a new setup or a issue that has just appeared?

Are you setting the stp root to be the Cisco or Hirscham?
What does the logging report regards these port flaps?

[Shani444]

Dear Paul,
This is new setup and my root is HM, according to HM they said their switch should Root otherwise it will not work with both MRP & RSTP. so HM is root.
1 I am receiving port flapping.
2 convergence time is after 6 ping drops, that should be without dropping or at least 1 drop.
3 lets say i have one end device connected on my cisco core switch and there are multiple vlans on it, like interface vlan. my management vlan is 100 and access vlan 200. so when i do ping any ip within the same subnet its dropping only 1 but when i ping through 100 to 200 vlan then facing 6 drops.
4 on cisco switch show spanning tree shows that only default vlan 1 selecting root as HM switch and rest of vlans selecting cisco as root.

hope you understand
Thanks
Shani

[Shani444]

Hi Paul,

Sorry for late reply. i have tried to solve this issue but couldn't solve yet. Now in my topology i have two layer 3 switches I5000 HSRP running on these switches and MRP configured on hirschman switches in the ring. as showing in the attached diagram connectivity. problem is when i do plug RSTP cable between Core 1 and Core 2 it start port flapping.

please let me know what i can do with that.

Regards

Shani