Hi I have a Cisco 1801 router connected to layer 2 switch on fa0 using the interface as a dot1q encapsulation trunk.
On both devices I have setup vlans 30 and 40 and the communication works fine between them. The respective subnets of either vlan can be reached on switch and router and my laptop when plugged into respective vlan interfaces on the switch or router.
The native vlan 1, which I've given the IP of 172.16.17.1/28 on the Cisco and 172.16.17.2/28 on the switch, is not reachable on either device when pinging from the console of either.
For vlan 30, I set up the sub interface as:
encap dot1q 30
I set up vlan 40 the same but with relevant changes.
I read the response from Paul to say that it is required to configure a subinterface to have the router process vlan 1 as the native vlan. I do not agree with this. If the physical interface is configured with an IP address then that interface will process frames that do not have a vlan tag.
I would agree that configuring a subinterface for the native vlan is a good practice. But I do not believe that it is a requirement.
I agree that we need to see how the interfaces are configured on both devices. I think it would also be beneficial to see the output of show cdp neighbor detail from the router and switch. And the output of show interface trunk from the switch might be helpful.
Python based Script to BULK Import/Delete devices using Cisco Prime API
Check my Repo on GitHub for all the details ( see below link )
ASR9001 DC chassis doesn't prints a syslog incase voltage for one of the Power Modules goes below certain threshold. Because of this the monitoring of PowerModule for any failure becomes difficult. This may cause outage incase of double fa...
16.6.4 Beta Release for Catalyst Switches
Enterprise Switching Business Unit is happy to announce availability of first Beta release of 16.6.4. This will be the first beta rebuild on the 16.6.4 targeted towards Catalyst 9500/9400/9300/3850/36...