[c-nsp] Strange ARP problem between 3560 and Linksys
Garry
gkg at gmx.de
Mon Sep 10 12:28:38 EDT 2007
Karol Mares wrote:
> Hi,
>
> On 9/5/07, *Garry Glendown* <garry at glendown.de
> <mailto:garry at glendown.de>> wrote:
>
> Raymond Macharia wrote:
> > Sounds like STP to me, how have you configured the STP. please
> privide a
> > simple schematic of physical connections. will help in narrowing
> down to the
> > source of your problem
>
> A=======B
> | |
> ----L----
>
>
> Can you provide output from the commands:
>
> show spanning-tree detail
Hm ... that would be slightly longer ... just getting the info for the
main vlan ... (Gi0/26 is the Uplink to Switch "L", Port Channel 24 the
link to B)
VLAN0099 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 99, address 0016.c7a4.0180
Configured hello time 2, max age 20, forward delay 15
We are the root of the spanning tree
Topology change flag not set, detected flag not set
Number of topology changes 462 last change occurred 2d20h ago
from Port-channel24
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 1, topology change 0, notification 0, aging 300
Port 2 (GigabitEthernet0/2) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.2.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.2, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 1243530, received 0
Port 3 (GigabitEthernet0/3) of VLAN0099 is forwarding
Port path cost 100, Port priority 128, Port Identifier 128.3.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.3, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is shared by default
BPDU: sent 4210777, received 0
Port 5 (GigabitEthernet0/5) of VLAN0099 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.5.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.5, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 6530793, received 0
Port 6 (GigabitEthernet0/6) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.6.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.6, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 6531248, received 0
Port 10 (GigabitEthernet0/10) of VLAN0099 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.10.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.10, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 5522649, received 0
Port 15 (GigabitEthernet0/15) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.15.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.15, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 134103, received 0
Port 16 (GigabitEthernet0/16) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.16.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.16, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 134104, received 0
Port 25 (GigabitEthernet0/25) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.25.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.25, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 5622583, received 0
Port 26 (GigabitEthernet0/26) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.26.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.26, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 790081, received 0
Port 27 (GigabitEthernet0/27) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.27.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.27, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 5622683, received 0
Port 800 (Port-channel24) of VLAN0099 is forwarding
Port path cost 1, Port priority 128, Port Identifier 128.800.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.800, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 3098638, received 52
--------------
Same output for switch B, again port 26 being the link to Switch L,
PortChannel 24 the link to switch A:
VLAN0099 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 99, address 0016.c7da.af80
Configured hello time 2, max age 20, forward delay 15
Current root has priority 32867, address 0016.c7a4.0180
Root port is 800 (Port-channel24), cost of root path is 1
Topology change flag not set, detected flag not set
Number of topology changes 565 last change occurred 2d20h ago
from GigabitEthernet0/15
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0, aging 300
Port 1 (GigabitEthernet0/1) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.1.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.1, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode by portfast trunk configuration
Link type is point-to-point by default
BPDU: sent 789791, received 0
Port 2 (GigabitEthernet0/2) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.2.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.2, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 789791, received 0
Port 3 (GigabitEthernet0/3) of VLAN0099 is forwarding
Port path cost 100, Port priority 128, Port Identifier 128.3.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.3, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is shared by default
BPDU: sent 789792, received 0
Port 4 (GigabitEthernet0/4) of VLAN0099 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.4.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.4, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 440037, received 0
Port 6 (GigabitEthernet0/6) of VLAN0099 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.6.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.6, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 789792, received 0
Port 8 (GigabitEthernet0/8) of VLAN0099 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.8.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.8, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 789792, received 0
Port 10 (GigabitEthernet0/10) of VLAN0099 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.10.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.10, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 789792, received 0
Port 13 (GigabitEthernet0/13) of VLAN0099 is forwarding
Port path cost 100, Port priority 128, Port Identifier 128.13.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.13, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is shared by default
BPDU: sent 789792, received 0
Port 15 (GigabitEthernet0/15) of VLAN0099 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.15.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.15, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 123853, received 0
Port 22 (GigabitEthernet0/22) of VLAN0099 is forwarding
Port path cost 19, Port priority 128, Port Identifier 128.22.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7da.af80
Designated port id is 128.22, designated path cost 1
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 789793, received 0
Port 26 (GigabitEthernet0/26) of VLAN0099 is blocking
Port path cost 10, Port priority 128, Port Identifier 128.26.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.26, designated path cost 0
Timers: message age 1, forward delay 0, hold 0
Number of transitions to forwarding state: 2
Link type is point-to-point by default
BPDU: sent 12, received 790018
Port 800 (Port-channel24) of VLAN0099 is forwarding
Port path cost 1, Port priority 128, Port Identifier 128.800.
Designated root has priority 32867, address 0016.c7a4.0180
Designated bridge has priority 32867, address 0016.c7a4.0180
Designated port id is 128.800, designated path cost 0
Timers: message age 1, forward delay 0, hold 0
Number of transitions to forwarding state: 2
Link type is point-to-point by default
BPDU: sent 17, received 790065
------------------------------
> show interface Gig0/26 switchport
Output from Switch A:
Name: Gi0/26
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
Switch B:
Name: Gi0/26
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
> show platform forward gig0/26 vlan xxx <src-mac> <dst-mac>
I used the mac of a router connected to Switch B as src and the mac of a
router connected to L as dst ...
Global Port Number: 26, lpn: 2 Asic Number: 4
Source Vlan Id: Real 99, Mapped 10. L2EncapType 0, L3EncapType 3
Hashes: L2Src 0x0A L2Dst 0x0E L3Src 0x0A L3Dst 0x0E
Lookup Key-Used Index-Hit A-Data
Classify 68_06B00000_0C3DE601-00_00000000_0C07AC02 00FFC 00000000
InputACL 20_06B00000_0C3DE601-00_00000000_0C07AC02 01FF8 01000000
L2LrnMsk FF_03FFFFFF_FFFFFFFF-00_000003FF_00000000
L2Learn 83_000A0000_0C07AC02-93_0000281A_00000000 01840 00000000
L2FwdMsk FF_03FFFFFF_FFFFFFFF
L2Fwd 83_000A0000_0C3DE601 00055 00000176
Station Descriptor: F01AF00A, DestIndex: F01A, RewriteIndex: F00A
==========================================
Egress: Asic 4, switch 1
Source Vlan Id: Real 99, Mapped 10. L2EncapType 0, L3EncapType 3
portMap 0x4, non-SPAN portMap 0x4
Output Packets:
------------------------------------------
GigabitEthernet0/26 Packet 1
Lookup Key-Used Index-Hit A-Data
OutptACL 30_06B00000_0C3DE601-00_00000000_0C07AC02 01FFC 01000000
Dropped due to failed deja vu check.
---------------
Anything obvious in there?
Tnx, -garry
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