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Community Member

there is a question in our campus network . help !!

we created some sub-interface on the 7500 serier router. after a running time , there is a problem in vlans. example

interface FastEthernet4/0/0.3

encapsulation dot1Q 20

ip address 10.1.19.9 255.255.255.248

no ip redirects

no ip proxy-arp

ip nat inside

no ip mroute-cache

at the vlan 20 , from 10.1.19.10 ping 10.1.9.9 is not connect. if renew vlan 20 vlan 21 , the problem is the solved.

1 REPLY
Community Member

Re: there is a question in our campus network . help !!

I really don't understatnd "if renew vlan 20 vlan 21 , the problem is the solved".

If you mean that you have changed the dot1q encapsulation to vlan21, then the problem is with your assignment to the Vlans or trunks on whatever switch port, if you mean that you pinged from the Vlan to other, then make sure that the subnets are assigned correctly to the Vlans since the subnet used for the router interface is /29.

good luck

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