Hello! Please, advice, if it is possible to implement two MX routers with VRRP by ethernet with the multiple MS switch stacks, connected directly to the MXs without any aggregation switches/core switch etc?
One MX router works fine, but two MX routers are going down in this case.
Thank you for any advice or help!
Check the recommended setup here, I think you need to add a few cables so that each switch that uplinks to the MX's, uplinks to both of them :
This topic may also be of help to you (mind you it's a long topic):
Also, direct link between the MX's is not recommended.
So, it seems to be OK, but when I insert the last switch stack (fourth), my network is going down.
Four switch stacks are inserted in 19,20,21,22 master router ports
Three switch stacks are inserted in 19,20,21 spare router ports.
Forks fine until I insert fourth switch stack in the spare router.
Router ports are configured to Trunk, no native vlan, drop untagged traffic.
Switch ports are configured with the RSTP enabled and STP guard disabled.
If three stacks works fine, and fourth causes an error then I'd double check whether the gear involved in the fourth stack is configured identically to the rest.
Are there any other links between the stacks?
No, There are no another links between any switches/stacks (except of stack cables on switch stacks).
All ethernet and sfp ports configured with rstp enabled and stp is checked as loop guard.
Strange thing is if I connect every stack per router (4 + 4 links total), network goes down. And if I disconnect physically one of the links (exactly ANY of the links, on any router) - it works fine.
I think, the trouble is in vrrp anyway (but direct vrrp ethernet link is disconnected, vrrp vlan is present and all the connection (mx-ms stacks) links are configured to allow all vlans, as trunks, dropping untagged traffic. vrrp vlan is configured with /30 subnet mask).