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New Member

Broadcast address on a WS-C2980G-A Switch

In one of our switches,the broadcast address is set up to 10.6.0.0. I Was reading and comparing it to differenent Switches which had the Broadcast 10.1.255.255

Does 10.6.0.0 broadcast on the switch affect the switch ? If so Can I just change it by :

set int sc0 10.6.0.3 255.255.0.0 10.6.255.255 ?

Thanks

Console> (enable) sh int

sl0: flags=50<DOWN,POINTOPOINT,RUNNING>

slip 0.0.0.0 dest 0.0.0.0

sc0: flags=63<UP,BROADCAST,RUNNING>

vlan 1 inet 10.6.0.3 netmask 255.255.0.0 broadcast 10.6.0.0

me1: flags=62<DOWN,BROADCAST,RUNNING>

inet 0.0.0.0 netmask 0.0.0.0 broadcast 0.0.0.0

5 REPLIES
New Member

Re: Broadcast address on a WS-C2980G-A Switch

Seeing 10.6.0.0 listed as the broadcast is very strange. I' ve never seen that with any of our 6509's. 10.6.0.0 is a network address. Anyway, you should be fine if you set it to the correct broadcast address of 10.6.255.255. I hope this helps!

Cisco Employee

Re: Broadcast address on a WS-C2980G-A Switch

You might have forrcefully set it this way. Here is a screen capture from my lab 6500

W2-3.17-C6506-A (enable) set int sc0 10.6.0.3 255.255.0.0 10.6.0.0

Interface sc0 IP address, netmask, and broadcast set.

W2-3.17-C6506-A (enable) sh int

sl0: flags=51

slip 0.0.0.0 dest 0.0.0.0

sc0: flags=63

vlan 1 inet 10.6.0.3 netmask 255.255.0.0 broadcast 10.6.0.0

W2-3.17-C6506-A (enable) set int sc0 10.6.0.3 255.255.0.0

Interface sc0 IP address and netmask set.

W2-3.17-C6506-A (enable) sh int

sl0: flags=51

slip 0.0.0.0 dest 0.0.0.0

sc0: flags=63

vlan 1 inet 10.6.0.3 netmask 255.255.0.0 broadcast 10.6.255.255

W2-3.17-C6506-A (enable)

New Member

Re: Broadcast address on a WS-C2980G-A Switch

So, Do I need to set the broadcast address or not in the following command? or it learns it automatic ?

int the set int sc0 10.6.0.3 255.255.0.0

The output from my switch for sh int :

Console> (enable) sh int

sl0: flags=50

slip 0.0.0.0 dest 0.0.0.0

sc0: flags=63

vlan 1 inet 10.6.0.3 netmask 255.255.0.0 broadcast 10.6.255.255

me1: flags=62

inet 0.0.0.0 netmask 0.0.0.0 broadcast 0.0.0.0

Thanks

Cisco Employee

Re: Broadcast address on a WS-C2980G-A Switch

The switch finds the broadcast address based on the subnet mask. You are good to go with "set int sc0 10.6.0.3 255.255.0.0"

Purple

Re: Broadcast address on a WS-C2980G-A Switch

Never seen that before ,someone must have consciously put that in . Normally you don't even have to put that in unless you want a different broadcast address , you just have to set the address and the mask for SC0 and the switch will supply the normal broadcast address for that range .

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