On Mar 29, 2010, at 11:06 PM, Yuri Bank wrote: > What about your other TOR switch? If it has elected Switch 3 as its root, > that would explain why traffic is being forwarded over that link.
There is no traffic inbound on g0/46 as shown below. > > > Can we see output from your other switches? > > > -Yuri > > On Mon, Mar 29, 2010 at 9:58 PM, Cord MacLeod <cordmacl...@gmail.com> wrote: > > On Mar 29, 2010, at 9:06 PM, Octavio Alvarez wrote: > > > On Fri, 26 Mar 2010 23:47:47 -0700, Cord MacLeod <cordmacl...@gmail.com> > > wrote: > > > >> 3 days ago traffic started showing up on the trunk port connecting my top > >> of rack switches. Each of these switches has it's own better trunk path > >> to the root bridge. I can't see why any traffic at all would traverse > >> these links unless the other trunk on g0/45 was down, which it isn't. > >> Also, spanning tree doesn't claim any topology changes. > > > > There's very little information. I could even think your traffic is > > real and STP doesn't have anything to do with it. > > Sorry for the late reply. Here is some more information. First, the traffic > is over 50mbit, I don't think it's STP. Second: > > switch3#show spanning-tree interface g0/46 > > Vlan Role Sts Cost Prio.Nbr Type > ---------------- ---- --- --------- -------- -------------------------------- > VLAN0001 Desg FWD 4 128.46 P2p > VLAN0100 Desg FWD 4 128.46 P2p > VLAN0101 Desg FWD 4 128.46 P2p > VLAN0102 Altn BLK 4 128.46 P2p > VLAN0120 Desg FWD 4 128.46 P2p > VLAN0200 Desg FWD 4 128.46 P2p > VLAN0231 Desg FWD 4 128.46 P2p > VLAN0250 Desg FWD 4 128.46 P2p > VLAN0321 Desg FWD 4 128.46 P2p > VLAN0450 Desg FWD 4 128.46 P2p > VLAN0777 Desg FWD 4 128.46 P2p > VLAN0888 Desg FWD 4 128.46 P2p > > switch3#sh spanning-tree root > > Root Hello Max Fwd > Vlan Root ID Cost Time Age Dly Root Port > ---------------- -------------------- --------- ----- --- --- ------------ > VLAN0001 24577 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0100 24676 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0101 24677 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0102 20582 0018.181b.d700 7 2 20 15 Gi0/45 > VLAN0120 24696 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0200 24776 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0231 24807 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0250 24826 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0321 24897 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0450 25026 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0777 25353 0017.e0d7.e180 4 2 20 15 Gi0/45 > VLAN0888 25464 0017.e0d7.e180 4 2 20 15 Gi0/45 > > switch3#show spanning-tree summary > Switch is in pvst mode > Root bridge for: none > Extended system ID is enabled > Portfast Default is disabled > PortFast BPDU Guard Default is disabled > Portfast BPDU Filter Default is disabled > Loopguard Default is disabled > EtherChannel misconfig guard is enabled > UplinkFast is disabled > BackboneFast is disabled > Configured Pathcost method used is short > > Name Blocking Listening Learning Forwarding STP Active > ---------------------- -------- --------- -------- ---------- ---------- > VLAN0001 0 0 0 2 2 > VLAN0100 0 0 0 9 9 > VLAN0101 0 0 0 2 2 > VLAN0102 1 0 0 1 2 > VLAN0120 0 0 0 19 19 > VLAN0200 0 0 0 16 16 > VLAN0231 0 0 0 2 2 > VLAN0250 0 0 0 2 2 > VLAN0321 0 0 0 5 5 > VLAN0450 0 0 0 2 2 > VLAN0777 0 0 0 2 2 > VLAN0888 0 0 0 2 2 > ---------------------- -------- --------- -------- ---------- ---------- > 12 vlans 1 0 0 64 65 > > switch3#show int g0/46 > GigabitEthernet0/46 is up, line protocol is up (connected) > ... > MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, > reliability 255/255, txload 5/255, rxload 1/255 > Encapsulation ARPA, loopback not set > Keepalive not set > Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000BaseTX > input flow-control is off, output flow-control is unsupported > ARP type: ARPA, ARP Timeout 04:00:00 > Last input 00:00:00, output 00:00:00, output hang never > Last clearing of "show interface" counters never > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 > Queueing strategy: fifo > Output queue: 0/40 (size/max) > 5 minute input rate 0 bits/sec, 0 packets/sec > 5 minute output rate 59995000 bits/sec, 3555 packets/sec > 1446844033 packets input, 479111376008 bytes, 0 no buffer > Received 35695615 broadcasts (0 multicasts) > 0 runts, 0 giants, 0 throttles > 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored > 0 watchdog, 35604297 multicast, 0 pause input > 0 input packets with dribble condition detected > 10988444843 packets output, 4655746445035 bytes, 0 underruns > 0 output errors, 0 collisions, 1 interface resets > 0 babbles, 0 late collision, 0 deferred > 0 lost carrier, 0 no carrier, 0 PAUSE output > 0 output buffer failures, 0 output buffers swapped out > > > Does this give enough information? From my understanding of spanning tree, > g0/46 should not be used for any traffic. g0/45 is the root port for all > vlans. > > > > _______________________________________________ > cisco-nsp mailing list cisco-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/