[Bridge] RSTP, vlans and bridges

Stephen Hemminger stephen at networkplumber.org
Sat Jan 7 17:47:25 UTC 2017


On Fri, 6 Jan 2017 18:15:24 +0300
gellert grindelwald <grindelwaldus at gmail.com> wrote:

> I tried to figure out how to setup RSTP on Linux with VLANs and bridges
> involved and now am completely confused.
> 
> I am trying to bridge three interfaces, two of which are supposed to act as
> trunk (hdlc0 and hdlc1) and one is supposed to act as access port (eth0). I
> also need to enable RSTP on each interface included in bridge, but with the
> configuration listed below RSTP packets are sent via hdlc0 and hdlc1 tagged
> (!) so other devices (like Cisco switches) reject them.
> 
> Here's my configuration:
> 
> ifconfig eth0 up
> 
> 
> ifconfig hdlc0 up
> ifconfig hdlc1 up
> 
> vconfig add hdlc0 42
> vconfig add hdlc1 42
> ifconfig hdlc0.42 up
> ifconfig hdlc1.42 up
> 
> 
> brctl addbr br1
> brctl addif br1 eth0
> brctl addif br1 hdlc0.42
> brctl addif br1 hdlc1.42
> 
> ifconfig br1 up
> brctl stp br1 on
> 
> 
> Another question: I also wonder how to configure RSTP in scenarios where I
> have multiple bridges: say eth0 is trunk with vlan 42-42 allowed, vlan 42
> is supposed to pass via hdlc0 and vlan 43 is supposed to go via hdlc1, so I
> have two bridges. If i enable RSTP on both bridges it will (probably) run
> independently on each bridge so I'll face problems soon?

1. If doing vlan and RSTP then you wan to use external Spanning Tree daemon mstp
  https://github.com/mstpd/mstpd
2. Learn to use modern linux network utils (iproute2) to configure network
and vlan.
  https://docs.cumulusnetworks.com/display/CL25/Spanning+Tree+and+Rapid+Spanning+Tree
   


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