We have a core 6509 routers and 3750 edge switches. We are getting this error of the 3750 occasional:
%SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port Port-channel2 on VLAN0007
%SPANTREE-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port Port-channel2 on VLAN0007
In researching the problem I have seen where the modes should be the same for the core as with the user switches. Here is the show spanning-tree summary for each unit:
6509
Switch is in pvst mode
Root bridge for: none
EtherChannel misconfig guard is enabled
Extended system ID is disabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
UplinkFast is disabled
BackboneFast is disabled
Pathcost method used is short
3750
Switch is in rapid-pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is enabled
Portfast BPDU Filter Default is disabled
Loopguard Default is enabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
Stack port is StackPort1
BackboneFast is disabled
Configured Pathcost method used is short
Should both be configured in Rapid-pvst Mode or Pvst Mode. Or is this configuration standard practice.
Also none of the interfaces are showing any errors
Thanks,
Tom
3750 interface information
Wilson-Place-3750#sho ether sum
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Gi1/0/1(D) Gi1/0/2(D) Gi1/0/3(P)
Gi1/0/4(P)
Wilson-Place-3750#sho int g1/0/3
GigabitEthernet1/0/3 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0015.63a2.4f9b (bia 0015.63a2.4f9b)
Description: 2gig to ComputerRoom EtherRing
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:10, output 00:00:05, 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 2501000 bits/sec, 590 packets/sec
5 minute output rate 743000 bits/sec, 328 packets/sec
23881154622 packets input, 16929727578445 bytes, 0 no buffer
Received 3270318983 broadcasts (678904938 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 678904938 multicast, 0 pause input
0 input packets with dribble condition detected
10826680035 packets output, 2681933801461 bytes, 0 underruns
0 output errors, 0 collisions, 0 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
Wilson-Place-3750#sho int g1/0/4
GigabitEthernet1/0/4 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0015.63a2.4f9c (bia 0015.63a2.4f9c)
Description: 2gig to ComputerRoom EtherRing
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:03, output 00:00:02, 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 5274000 bits/sec, 1055 packets/sec
5 minute output rate 112000 bits/sec, 97 packets/sec
29122557370 packets input, 17278392802072 bytes, 0 no buffer
Received 6242458330 broadcasts (2459628072 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 2459628072 multicast, 0 pause input
0 input packets with dribble condition detected
5143594908 packets output, 825795046511 bytes, 0 underruns
0 output errors, 0 collisions, 0 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
Wilson-Place-3750#
