You can configure hundreds of VLANs in one EX series switch. Describe the concepts, benefits, operation, or Cisco - Juniper BGP and MPLS Configuration Examples and Best Practices - blueprints/PE7_20170430_150712_juniper. Similarly, Host A and Host E are on VLAN 3, and Host B and Host C are on VLAN 2. Well, I don't want my SVI to be up if this is the last port that is active.Juniper inter vlan routing 1 and earlier. If that port is the only one up, then my interface VLAN protocol is up. Where could I use this? Lets say I have port that is up, in a vlan, and is going to a device that will not be communicating on that vlan (like a monitoring source port). If there is multiple ports up in that Vlan, then the SVI's protocol status will remain up until the last port (that does NOT have the autostate command on it) goes down. So this command does not allow you to have an SVI up when there are no ports active in that VLAN. So this command eliminates a port from effecting the SVI at all. That means if this interface is up, the only way for the SVI's protocol to be up is to have another port that is up in that Vlan and does not have the autostate exlcuded command on it. The interface does not effect the SVI at all, so if that is the case, when the interface comes up, nothing happens. There is no way for the interface to effect if the SVI goes down, this is why. Which means, if the interface goes up, it will not bring up the SVI. The autostate excluded command states this: The interface will not play a factor in determining if the SVI's protocol status will be up or down. The second I put the autostate excluded command on f0/1, then protocol for interface Vlan-10 will go down, and that connected interface will be removed from the routing table. F0/1 is status and protocol is up, the protocol of the SVI for Vlan-10 goes up. Using the 'switchport autostate excluded' command will not keep your SVI up and running. I am not sure why this command is perceived as it is. Sadly, this command seems only to be available on routers and not Catalyst switches, where one assumes it would be most useful. On some platforms (routers running 12.4T at least, possibly others), Cisco includes the ability to disable the autostate feature with the command no autostate under SVI configuration. For example, an engineer might wish for an SVI to always remain up so that a can be reached via its associated IP address even if all ports associated with that VLAN are down (or if the VLAN itself has gone missing). While usually very handy, this behavior might not always be desirable.
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to upĬisco refers to this behavior as autostate. Switch(config-if)# switchport access vlan 10
Once it is, and provided at least one of those ports is operational, we see the SVI line protocol transition to the up state: Typically, a newly created VLAN will not yet have been assigned to any ports. That port must be in the STP forwarding state.At least one switched port in the VLAN (access or trunk) must be up.Its VLAN must exist and be active in the VLAN database.
WHAT IS THE DEFAULT SVI ON A CISCO SWITCH FULL
This is because an SVI must meet all of the following conditions to transition to the full "up/up" state: Vlan1 unassigned YES unset administratively down downįastEthernet0/1 unassigned YES unset down downįastEthernet0/2 unassigned YES unset down down Interface IP-Address OK? Method Status Protocol Consider the following minimal configuration: Cisco IOS SVIs, also called VLAN interfaces, exhibit what might be considered an odd behavior: by default, an SVI will show an interface state of up but a line protocol state of down.
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