Bridge loop issue on CCR

ishan · Fri Apr 08, 2016 9:57 am

Hello,
I have a simple network architecture with a CCR-1036-12G and 1 uplink (BGP) and bridge of remaining ports connected to separate TOR switches (one Cisco 2960 in each rack). Each TOR switch is further connected to an unmanaged TP link switch used for IPMI access.

Network diagram Image

- http://imgur.com/4VKyfgS

Bridge is configured -

 0  R name="bridge1" mtu=1500 actual-mtu=1500 l2mtu=1590 arp=enabled 
      mac-address=D4:CA:6D:E1:5F:6D protocol-mode=rstp priority=0x8000 
      auto-mac=yes admin-mac=00:00:00:00:00:00 max-message-age=20s 
      forward-delay=15s transmit-hold-count=6 ageing-time=5m

ether11 is WAN and ether1-10 is configured as a bridge.

Problem 1 -

All connected ports of the bridge receive all the traffic received by the WAN port.

Interfaces image -

Problem 2 -

Every few minutes, all switch ports receive traffic (seems related to to problem 1). It causes packet loss within the LAN during this time.

Normal switch -

During issue -

Any ideas what is the issue ?

CCR versions
RouterOS - 6.34.2 .
Firmware - 3.27
We have tried disabling / enabling RSTP on the bridge and rebooting the router.

Thank you for your time.

pukkita · Fri Apr 08, 2016 12:25 pm

Firmware version? (See System > Routerboard)

ishan · Fri Apr 08, 2016 12:48 pm

Firmware version? (See System > Routerboard)

Factory Firmware 3.09
Current Firmware 3.27
Upgrade Firmware 3.27

Using the latest firmware.

pukkita · Fri Apr 08, 2016 7:22 pm

Can you test if disconnecting one of the tplinks makes a difference, at least on that port?

Have you Torched the traffic? it may be multicast related to IPMI?

Bridge loop issue on CCR

Bridge loop issue on CCR

Re: Bridge loop issue on CCR

Re: Bridge loop issue on CCR

Re: Bridge loop issue on CCR