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WRV200 and "Spanning tree"

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by ArchCC, Oct 14, 2007.

  1. ArchCC

    ArchCC LI Guru Member

    Is it normal, that router every 2 seconds send paket to MAC: 01-80-C2-00-00-00 (Spanning tree protocol)? Is he send it to Wan or just to lan?

    0x0000 01 80 C2 00 00 00 00 1A-70 31 B6 14 00 26 42 42 .€Ã‚.....p1¶..&BB
    0x0010 03 00 00 00 00 00 80 00-00 1A 70 31 B6 14 00 00 ......€...p1¶...
    0x0020 00 00 80 00 00 1A 70 31-B6 14 80 01 00 00 14 00 ..€...p1¶.€.....
    0x0030 02 00 0F 00 A5 A5 A5 A5-A5 A5 A5 A5 ....¥¥¥¥¥¥¥¥

    Try to test firmware 1.0.36Beta...
    Wlan disabled, connected only port1.
  2. DocLarge

    DocLarge Super Moderator Staff Member Member

    My first thought is that this is nothing more than the wireless aspect of the router sending "hello" packets to "any" wireless devices in the area to see if any are within it's range. Being that your wireless device receiving the signal from the router "is not" responsible for routing, this most likely is just a second process running in the background (wireless device accountability done by the router).

    Again, this is just "my opinion" on it. :)

  3. ArchCC

    ArchCC LI Guru Member

    Wlan is disabled and there are only one connection by lan.
  4. eric_stewart

    eric_stewart Super Moderator Staff Member Member

    There's no way of telling whether it's sending out STP on the WAN interface unless you can somehow insert a protocol analyzer (sniffer) on a hub there. As for STP on the LAN side. Yes. This is normal. It's not that your WRV200 is trying to interact with an existing instance of spanning tree (though it will if it's connected into a LAN where STP is running). Rather, STP is enabled on these SOHO devices for users who inadvertently patch two or more of the device's built-in switch's ports together. This creates a topological loop which STP's loop avoidance mechanism will detect and deal with by placing one (or more) ports into the blocking state.

    This way the Linksys, D-Link and SMCs (etc.) of the world don't get support calls from customers who, while striving for redundancy in their internal LAN, have inadvertently created a loop.


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