The following example shows valid IP address configurations on two loopback interfaces. Up to thirty-two IP addresses are supported on a loopback interface. You can configure multiple IP addresses on a loopback interface ( lo0 to lo7). In the same way, if you configure a loopback interface ( lo1) with IP address 172.16.101.8, you cannot configure another loopback interface ( lo2) with IP address 172.16.101.8. This means that the address cannot be used by a VLAN interface or another loopback interface.įor example, if you configure a VLAN with IP address 172.16.100.8/24, you cannot configure a loopback interface with IP address 172.16.100.8. The maximum number of IP addresses supported on a switch is 2048, which includes all IP addresses configured for both VLANs and loopback interfaces (except for the default loopback IP address 127.0.0.1).Įach IP address that you configure on a loopback interface must be unique in the switch. Loopback interfaces share the same IP address space with VLAN configurations.

Recommendation: Check Configuration of the switch, also make sure devices connected to the switch are not mirroring the traffic back to switch. Remove collar and isolate both ends of the same strand of cable. One of our Cisco 3560 switches keeps showing this warning: Description: Gi0/15: Detected a Loop back. If I enable STP on 2 ports, what happen the port states I have attached the topology below. For the switch, Ive heard we can set a loopback address (W.X.Y.Z/32) and use it to configure the switch without any fear of loosing access to it misconfiguring something. they are both attached to a virtual interface, but for the PC, only it can access its loopback. Viewed 223 times 3 I am using Dell switch and I looped it to itself. To me, the loopback from a switch is different from the PC ones. Ask Question Asked 8 years, 2 months ago. The way it works is that I just 'enable' the router functionality and then.You can configure a loopback interface only from the CLI you cannot configure a loopback interface from the WebAgent or Menu interface. Creating a single strand of fiber out of a duplex cable takes a couple of extra steps. Consequences of an intra-switch Loopback cable. I recently realized that I have a switch configuration with an unintended potential side-effect.I have an Aruba 6300F with several VLANs on it. Can I plug the mgmt interface of a switch into one of its own switch ports? Networking.What could an IT Pro do with superpowers? Which IT tasks would you use them in and how? Which Superpowers Would You Like to Have? Water Cooler.Satellite networks are at high risk, according to a new warning from the FBI and CISA. Snap! SATCOM Threat, IE End of Life, Bricked Macs, Planet 9, Lego Delorean Spiceworks OriginalsįBI and CISA warn over threats to satellite communications networks.But, they did something I've been wanting for years (decades?), so I guess there needs to be acknowledgement. I could give a 'He Tasks Me' speech like Khan in 'Star Trek II: The Wrath of Khan'.

Shout Out To Xfinity (Personal Home Internet) Networkingįirst, this pains me.

Loopback cable on switch