On the remote end we enable telnet debugging, but no messages are shown (only the final messaged for ending session)Ġ0:23:03 Intermediate_switch %SHELL/4/LOGINFAILED(s):Failed to login. Info: The connection was closed by the remote host. So it can be used for redirecting tunneled traffic of one interface to the same tunnel interface or tunneled traffic from one interface to un-tunneled traffic on the same interface.įrom the initiator device, seems that the connection is established, but it’s not working (finally the remote end drops the session) U turn or U hair pin it was initially used and designed for Spoke to Spoke connection in firewalls but later was also used for other purposes, like QnQ. So in the end we allow only Outer_VLAN=333 on the trunk interface connecting botw switches. So, we are performing QinQ on the device (Outer_VLAN=333, Inner_VLAN=3). The other port is dot1q-tunnel interface, and stacks the VLAN 333 to all frames. One of the ports is a trunk interface (with allowed vlans ). On each switch we connect 2 ports with a wire. When we use physical hairpinnin, we have ping connectivity but we cannot access with Telnet/SSH between the switches Vlanifs.Ĭonnection is back-to-back 2xS5720 switches through a trunk interface and we define VLAN3 and Vlanif 3 on both switches (/30 addressing).
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