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Troubleshooting common issues
Chapter 16: Troubleshooting 359
To use Observer with the Cisco 6xxx switch, you must disable auto negotiation.
With auto negotiation enabled, the switch and probe may create a link when first
starting the probe, but if the cable is unplugged or if a configuration change to
the SPAN/mirror port is applied, you will lose connectivity to the switch. To turn
auto negotiation off on the switch, follow the directions based on the OS you are
using on your switch.
Tip!
Disabling Auto Negotiation is recommended on all models/brands of
switches when using a SPAN/mirror port to a full-duplex Gigabit Probe.
Cisco CatOS switches
1. To disable port negotiation:
Console> enable Console>(enable) set port negotiation mod_num/
port_num disable
2. To verify port negotiation:
Console.(enable) show port negotiation [mod_num/port_num]
3. To enable port negotiation (should you remove the gigabit Observer product
from the switch):
Console>(enable) set port negotiation mod_num/port_num enable
Cisco IOS switches
1. To disable port negotiation:
Console> enable
Console# configure terminal
Console(config)# interface gigabitethernet mod_mun/port_num
Console(config-if)# speed nonegotiate
2. To verify port negotiation:
Console# show interfaces gigabitethernet mod_mun/port_num
3. To enable port negotiation (should you remove the gigabit Observer product
from the switch):
Console(config)# interface gigabitethernet mod_mun/port_num
Console(config-if)# no speed nonegotiate
Ports used by Observer products v16 and earlier
Observer products v16 and earlier use many ports to communicate. If your
environment includes these products, open these ports on your firewalls.
Table 13. Ports used by Observer products v16 and earlier
Port Functionality
TCP 25901 Observer expert and trending data
Observer Apex to Observer. Observer GigaStor/Probe
TCP 25903 Observer/GigaStor/Probe redirection/connection request
GigaStor/Probe administration
TCP 80 Observer reporting and reconstruction features
TCP 3389 Remote Desktop connection.