Cisco WS-C4507R Troubleshooting Manual page 24

RST-3508
9805_05_2004_c2
RST-3508
9805_05_2004_c2
© 2004 Cisco Systems, Inc. All rights reserved. Printed in USA.
Presentation_ID.scr
L2 Forwarding Tables to Verify
Reachability
cat4500#show mac-address-table dynamic
Unicast Entries
vlan mac address type
-------+---------------+--------+---------------------+--------------------
1 0000.0c07.ac01 dynamic ip
1 0009.e845.64bf dynamic ip
1 0030.7b4e.340a dynamic ip,assigned
41 0000.0c07.ac29 dynamic ip
50 0000.0c07.ac32 dynamic ip
50 000a.4172.df7f dynamic ip
cat4500#show mac-address-table address 0000.0c07.ac29
Unicast Entries
vlan mac address type
-------+---------------+--------+---------------------+--------------------
41 0000.0c07.ac29 dynamic ip
cat4500#show mac-address-table count
MAC Entries for all vlans:
Dynamic Unicast Address Count:
Static Unicast Address (User-defined) Count:
Static Unicast Address (System-defined) Count:
Total Unicast MAC Addresses In Use:
Total Unicast MAC Addresses Available:
Multicast MAC Address Count:
Total Multicast MAC Addresses Available:
© 2004 Cisco Systems, Inc. All rights reserved.
Show Interface Error Counters
FCS-err is the number of valid size frames with FCS (frame check sequence) errors but no
•
framing errors; this is typically a physical issue (cabling, bad port, NIC card,...) but can also
indicate a duplex mismatch
Align-err is the number of frames with alignment errors (frames that do not end with an even
•
number of octets and have a bad CRC) received on the port; these usually indicate a physical
problem (cabling, bad port, NIC card,...) but can also indicate a duplex mismatch; when the
cable is first connected to the port, some of these errors may occur; also, if there is a hub
connected to the port then collisions between other devices on the hub may cause these errors
Late-coll (late collisions) is the number of times that a collision is detected on a particular port
•
late in the transmission process; for a 10Mbit/s port this is later than 512 bit-times into the
transmission of a packet; five hundred and twelve bit-times corresponds to 51.2 microseconds
on a 10 Mbit/s system; this error can indicate a duplex mismatch among other things; for the
duplex mismatch scenario the late collision would be seen on the half duplex side; as the half
duplex side is transmitting, the full duplex side does not wait its turn and transmits
simultaneously causing a late collision; late collisions can also indicate an Ethernet
cable/segment that is too long; collisions should not be seen on ports configured as full duplex
Single-coll (single collision) is the number of times one collision occurred before the port
•
transmitted a frame to the media successfully; collisions are normal for port configured as half
duplex but should not be seen on full duplex ports; if collisions are increasing dramatically this
points to a highly utilized link or possibly a duplex mismatch with the attached device
Multi-coll (multiple collision) is the number of times multiple collisions occurred before the port
•
transmitted a frame to the media successfully; collisions are normal for port configured as half
duplex but should not be seen on full duplex ports; if collisions are increasing dramatically this
points to a highly utilized link or possibly a duplex mismatch with the attached device
© 2004 Cisco Systems, Inc. All rights reserved.
protocols port
FastEthernet3/37
FastEthernet3/37
FastEthernet3/37
FastEthernet3/19
FastEthernet3/19
FastEthernet3/19
protocols port
FastEthernet3/19
6
0
1
7
32768
11
16384
47 47 47
48 48 48