Switching

 View Only
last person joined: 7 hours ago 

Ask questions and share experiences about EX and QFX portfolios and all switching solutions across your data center, campus, and branch locations.
  • 1.  EX4650 allow trunks to pass double tags

    Posted 03-24-2023 16:20
    Edited by daa 03-30-2023 15:22

    Example topology:

    custA / custB > switch1 > EX4650 > switch2 > custA / custB

    custA outer tag 101 

    custB outer tag 102

    The EX4650 should allow any inner tag on both vlan 101 and 102.

    Dot1Q tunnel is setup on switch1 and switch2. EX4650 just needs to bridge.

    Standard trunk config doesnt allow the inner tags to pass. What is needed to make this function?

    xe-0/0/0 {
        description "to switch1";
       mtu 1522;
        unit 0 {
            family ethernet-switching {
                interface-mode trunk;
                vlan {
                    members [ custA custB ];
                }
            }
        }
    }

    xe-0/0/1 {
        description "to switch2";
        mtu 1522;
        unit 0 {
            family ethernet-switching {
                interface-mode trunk;
                vlan {
                    members [ custA custB ];
                }
            }
        }
    }

    .......

    custA {
        vlan-id 101;
    }
    custB {
        vlan-id 102;
    }



    ------------------------------
    Dan Graham
    ------------------------------



  • 2.  RE: EX4650 allow trunks to pass double tags

    Posted 03-29-2023 14:23

    After further review, the above configuration is removing the inner tag. What needs adjusted to retain this?

    Both tags are ether-type 0x8100.



    ------------------------------
    Dan Graham
    ------------------------------



  • 3.  RE: EX4650 allow trunks to pass double tags

    Posted 03-30-2023 15:06
    Edited by spuluka 04-01-2023 12:33

    Hey Dan,

    Are switch 1 and switch 2 doing private VLANs (https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic-map/private-vlans.html) or regular VLAN tagging? If you can post the interface config from switch 1 & 2 that'd be helpful. 

    Thanks!





  • 4.  RE: EX4650 allow trunks to pass double tags

    Posted 03-30-2023 15:22
    Edited by spuluka 04-01-2023 12:33

    No private vlans.

    Here is the example switch1 and switch2 interface config.

    interface GigabitEthernet0/0
     description TO EX4650
     switchport trunk allowed vlan 101, 102
     switchport trunk encapsulation dot1q
     switchport mode trunk
     switchport nonegotiate
     mtu 1504
    !
    interface GigabitEthernet0/1
     description TO CUSTOMER A
     switchport access vlan 101
     switchport mode dot1q-tunnel
     switchport nonegotiate

    !
    interface GigabitEthernet0/1
     description TO CUSTOMER B
     switchport access vlan 102
     switchport mode dot1q-tunnel
     switchport nonegotiate


    Customer switch example on both sides would be:

    interface GigabitEthernet0/1
     switchport trunk allowed vlan 2,3
     switchport trunk encapsulation dot1q
     switchport mode trunk
     switchport nonegotiate



    ------------------------------
    Dan Graham
    ------------------------------



  • 5.  RE: EX4650 allow trunks to pass double tags

    Posted 03-31-2023 16:36

    Oh ok, Documentation says "Some switching features, however, cannot be configured on logical interface unit 0. Features such as Q-in-Q tunneling require the logical interface to transmit VLAN-tagged frames."

    Looks like the service provider style supports units other than 0. Can you try--

    xe-0/0/0 {
      description "to switch1";
      flexible-vlan-tagging;     mtu 1522;     encapsulation flexible-ethernet-services;     unit 101 {         encapsulation vlan-bridge;         vlan-id 101;     }
    unit 102 {         encapsulation vlan-bridge;         vlan-id 102;     }
    xe-0/0/1 {
        description "to switch2";
      flexible-vlan-tagging;     mtu 1522;     encapsulation flexible-ethernet-services;     unit 101 {         encapsulation vlan-bridge;         vlan-id 101;     }
    unit 102 {         encapsulation vlan-bridge;         vlan-id 102;     }


    You can use 'load replace terminal' and paste in the above if it's an exact match, then Ctrl+D to exit. Or type the set commands by hand. Let me know how it goes!



    ------------------------------
    Kyler H
    ------------------------------



  • 6.  RE: EX4650 allow trunks to pass double tags

    Posted 03-31-2023 17:23

    I have already tested that style of config with the same result.



    ------------------------------
    Dan Graham
    ------------------------------