05-26-2010 09:50 AM - edited 03-06-2019 11:16 AM
Hello,
Issue 1).
I am applying the following command: "spanning-tree portfast default" in config mode and then when I check the running-config I don't see all ports in portfast as I understand they should be according to book...... is there any explanation to this? Is this IOS version related?
Issue 2).
I have some ports manually configured as portfast. Then I apply the command "spanning-tree porfast bpduguard defaul" but when I check the running-config I don't see those ports with the bpduguard as I understand they should be according to book...... any explanation?
Thanks.
Solved! Go to Solution.
05-26-2010 10:28 AM
Hey,
Switch(config)#spanning-tree portfast ?
default Enable portfast by default on all access ports
so that means, it enable portfast but it will not write the spanning-tree portfast command for each interface into the running or startup config.
In your config, u have just 1 entry "spanning-tree portfast default" so all access ports are portfast.
Btw. Same with bpduguard
U can check, if its globally activated by "show spanning-tree summary"
Bye,
Patrick
05-26-2010 10:28 AM
Hey,
Switch(config)#spanning-tree portfast ?
default Enable portfast by default on all access ports
so that means, it enable portfast but it will not write the spanning-tree portfast command for each interface into the running or startup config.
In your config, u have just 1 entry "spanning-tree portfast default" so all access ports are portfast.
Btw. Same with bpduguard
U can check, if its globally activated by "show spanning-tree summary"
Bye,
Patrick
05-26-2010 10:36 AM
Hi,
Issue 1).
I am applying the following command: "spanning-tree portfast default" in config mode and then when I check the running-config I don't see all ports in portfast as I understand they should be according to book...... is there any explanation to this? Is this IOS version related?
- "spanning-tree portfast default" command will enable portfast on all switchports in access mode. This will not be reflected in ruuning config. If you can check "show spanning-tree interface
- Same shud be applicable for Issue 2 as well. I dont remember the command to verify the same.
HTH,
Nagendra
05-26-2010 10:41 AM
Sounds like you are expecting these commands to appear in each interface configuration section. If so, that is incorrect.
acc01#sh run | i default
spanning-tree portfast default
spanning-tree portfast bpduguard default
Note: Global configuration commands found in running config.
acc01#sh run int gi0/1
interface GigabitEthernet0/1
description
switchport access vlan
switchport mode access
switchport nonegotiate
switchport port-security
switchport port-security violation restrict
load-interval 60
no keepalive
no cdp enable
spanning-tree guard root
ip dhcp snooping limit rate 15
end
Note: Absence of interface configuration commands pertaining to portfast and bpduguard.
acc01#sh spanning-tree interface gi0/1 portfast
MST00 enabled
MST01 enabled
MST02 enabled
Note: Portfast enabled on each spanning tree instance, on this interface.
Note:Your output may look different than ours as we are using Multiple STP. You are likely using a different STP.
FYI: The ports will need to be configured for access mode.
E.g.:
interface GigabitEthernet0/1
switchport access vlan 100
switchport mode access
Best Regards,
Mike
05-26-2010 02:40 PM
Hello Mike,
very good post with show commands showing the facts
rated as it deserves (5P)
Best Regards
Giuseppe
05-26-2010 02:55 PM
Giuseppe:
Thank you for the positive feedback, and your extensive forum support.
Best Regards,
Mike
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