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  • 1.  IRB interface not able to ping over trunk links on vMX

    Posted 21 days ago

    Hi everyone!

    I am currently studying for an exam using Juniper vLabs. Within "OSPF Multi-area" sandbox, I tried connecting vMX1 and vMX2 with a trunk link. Then I setup IRB interfaces on both devices and bind them to their bridge domains.  However, it doesn't seem like it can ping each other. I've tried various configurations from the internet but non works so far. Below are some debugging of the interfaces and the configurations.

    vMX1

    Configuration

    interfaces {
    ge-0/0/2 {
        unit 0 {
            family bridge {
                interface-mode trunk;
                vlan-id-list 100;
            }
        }
    }
    irb {
        unit 100 {
            family inet {
                address 10.100.0.1/24;
            }
        }
    }
}

bridge-domains {
    VLAN100 {
        domain-type bridge;
        vlan-id 100;
        routing-interface irb.100;
    }
}

    Show commands

    jcluser@vMX1# run show interfaces ge-0/0/2 
Physical interface: ge-0/0/2, Enabled, Physical link is Up
  Interface index: 151, SNMP ifIndex: 529
  Link-level type: Ethernet, MTU: 1514, MRU: 1522, LAN-PHY mode, Speed: 1000mbps, BPDU Error: None, Loop Detect PDU Error: None,
  Ethernet-Switching Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled, Auto-negotiation: Enabled,
  Remote fault: Online
  Pad to minimum frame size: Disabled
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: 00:50:56:be:b5:9b, Hardware address: 00:50:56:be:b5:9b
  Last flapped   : 2024-08-18 16:30:04 UTC (00:57:41 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  Active alarms  : None
  Active defects : None
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0
  Ethernet FEC statistics              Errors
    FEC Corrected Errors                    0
    FEC Uncorrected Errors                  0
    FEC Corrected Errors Rate               0
    FEC Uncorrected Errors Rate             0
  Interface transmit statistics: Disabled

  Logical interface ge-0/0/2.0 (Index 332) (SNMP ifIndex 545)
    Flags: Up SNMP-Traps 0x24024000 Encapsulation: Ethernet-Bridge
    Input packets : 0
    Output packets: 40
    Protocol bridge, MTU: 1514
      Flags: Is-Primary, Trunk-Mode
    jcluser@vMX1# run show bridge domain 

Routing instance        Bridge domain            VLAN ID     Interfaces
default-switch          VLAN100                  100      
                                                             ge-0/0/2.0
    jcluser@vMX1# run show interfaces terse | match ge 
ge-0/0/0                up    up
ge-0/0/0.0              up    up   inet     10.100.12.1/24  
ge-0/0/1                up    up
ge-0/0/1.0              up    up   inet     10.100.14.1/24  
ge-0/0/2                up    up
ge-0/0/2.0              up    up   bridge  
ge-0/0/3                up    up
ge-0/0/3.0              up    up   inet     10.100.15.1/24  

jcluser@vMX1# run show interfaces terse | match irb   
irb                     up    up
irb.100                 up    up   inet     10.100.0.1/24
    jcluser@vMX1# run show route 10.100.0.0/24 

inet.0: 24 destinations, 24 routes (24 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.100.0.0/24      *[Direct/0] 00:49:59
                    >  via irb.100
10.100.0.1/32      *[Local/0] 00:49:59
                       Local via irb.100

    vMX3

    Configuration

    interfaces {
    ge-0/0/2 {
        unit 0 {
            family bridge {
                interface-mode trunk;
                vlan-id-list 100;
            }
        }
    }
    irb {
        unit 100 {
            family inet {
                address 10.100.0.3/24;
            }
        }
    }
}

bridge-domains {
    VLAN100 {
        domain-type bridge;
        vlan-id 100;
        routing-interface irb.100;
    }
}

    Show commands

    jcluser@vMX3# run show interfaces ge-0/0/2
Physical interface: ge-0/0/2, Enabled, Physical link is Up
  Interface index: 151, SNMP ifIndex: 529
  Link-level type: Ethernet, MTU: 1514, MRU: 1522, LAN-PHY mode, Speed: 1000mbps, BPDU Error: None, Loop Detect PDU Error: None,
  Ethernet-Switching Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled, Auto-negotiation: Enabled,
  Remote fault: Online
  Pad to minimum frame size: Disabled
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: 00:50:56:be:63:a6, Hardware address: 00:50:56:be:63:a6
  Last flapped   : 2024-08-18 16:30:26 UTC (00:55:55 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  Active alarms  : None
  Active defects : None
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0
  Ethernet FEC statistics              Errors
    FEC Corrected Errors                    0
    FEC Uncorrected Errors                  0
    FEC Corrected Errors Rate               0
    FEC Uncorrected Errors Rate             0
  Interface transmit statistics: Disabled

  Logical interface ge-0/0/2.0 (Index 332) (SNMP ifIndex 545)
    Flags: Up SNMP-Traps 0x24024000 Encapsulation: Ethernet-Bridge
    Input packets : 0
    Output packets: 20
    Protocol bridge, MTU: 1514
      Flags: Is-Primary, Trunk-Mode
    jcluser@vMX3# run show bridge domain 

Routing instance        Bridge domain            VLAN ID     Interfaces
default-switch          VLAN100                  100      
                                                             ge-0/0/2.0
    jcluser@vMX3# run show interfaces terse | match ge 
ge-0/0/0                up    up
ge-0/0/0.0              up    up   inet     10.100.34.1/24  
ge-0/0/1                up    up
ge-0/0/1.0              up    up   inet     10.100.23.2/24  
ge-0/0/2                up    up
ge-0/0/2.0              up    up   bridge  
ge-0/0/3                up    down
ge-0/0/3.16386          up    down
ge-0/0/4                up    up
ge-0/0/4.0              up    up   inet     10.100.35.1/24 

jcluser@vMX3# run show interfaces terse | match irb   
irb                     up    up
irb.100                 up    up   inet     10.100.0.3/24 
    jcluser@vMX3# run show route 10.100.0.0/24 

inet.0: 24 destinations, 24 routes (24 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.100.0.0/24      *[Direct/0] 00:48:53
                    >  via irb.100
10.100.0.3/32      *[Local/0] 00:48:53
                       Local via irb.100



    ------------------------------
    Khine Lin Kyaw
    ------------------------------



  • 2.  RE: IRB interface not able to ping over trunk links on vMX

    Posted 3 days ago

    Hi,

    Configuration looks OK.

    To me, most probably it is because of how routers are connected in the background.



    ------------------------------
    FARID AKHUNDOV
    ------------------------------

    Original Message