Description

"vlan-id-range" can only support L2 encapsulation

Symptoms

Customer may configured vlan-id-range with L3 IFL interface. 

Refer below example:
set interfaces xe-0/2/0 flexible-vlan-tagging
set interfaces xe-0/2/0 encapsulation flexible-ethernet-services
set interfaces xe-0/2/0 unit 100 vlan-id-range 100-200
set interfaces xe-0/2/0 unit 100 family inet address 192.168.0.1/24

 

The commit check will pass and logical interface can be created normally.

user@mx# run show interfaces xe-0/2/0.100

 Logical interface xe-0/2/0.100 (Index 334) (SNMP ifIndex 577)

  Flags: Up SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.100-200 ] Encapsulation: ENET2

  Input packets : 411764

  Output packets: 19

  Protocol inet, MTU: 1500

  Max nh cache: 75000, New hold nh limit: 75000, Curr nh cnt: 0, Curr new hold cnt: 0, NH drop cnt: 0

   Flags: Sendbcast-pkt-to-re

   Addresses, Flags: Is-Default Is-Preferred Is-Primary

    Destination: 192.168.0/24, Local: 192.168.0.1, Broadcast: 192.168.0.255

  Protocol multiservice, MTU: Unlimited

 

 

But only first vlan can sent out arp reply, for above example, only vlan 100 sends out arp reply.

Solution

"vlan-id-range" is used for L2(ccc/vpls/bridge) encapsulation.

For subscribers with different vlan and share same gateway, solution should be packet trigger service.
We need to create vlan and set vlan-id for each logical interface.
Example for "vlan 100" and "vlan 101" as below:
set interfaces xe-0/2/0 flexible-vlan-tagging
set interfaces xe-0/2/0 unit 100 demux inet address source
set interfaces xe-0/2/0 unit 100 demux inet auto-configure address-ranges dynamic-profile static network 192.168.0.0/24 range r1 low 192.168.0.2/32
set interfaces xe-0/2/0 unit 100 demux inet auto-configure address-ranges dynamic-profile static network 192.168.0.0/24 range r1 high 192.168.0.200/32
set interfaces xe-0/2/0 unit 100 vlan-id 100
set interfaces xe-0/2/0 unit 100 family inet unnumbered-address lo0
set interfaces xe-0/2/0 unit 100 family inet unnumbered-address preferred-source-address 192.168.0.1
set interfaces xe-0/2/0 unit 101 demux inet address source
set interfaces xe-0/2/0 unit 101 demux inet auto-configure address-ranges dynamic-profile static network 192.168.0.0/24 range r1 low 192.168.0.2/32
set interfaces xe-0/2/0 unit 101 demux inet auto-configure address-ranges dynamic-profile static network 192.168.0.0/24 range r1 high 192.168.0.200/32
set interfaces xe-0/2/0 unit 101 vlan-id 101
set interfaces xe-0/2/0 unit 101 family inet unnumbered-address lo0.0
set interfaces xe-0/2/0 unit 101 family inet unnumbered-address preferred-source-address 192.168.0.1
set interfaces lo0 unit 0 family inet address 192.168.0.1/32 preferred

set dynamic-profiles static interfaces demux0 unit "$junos-interface-unit" no-traps
set dynamic-profiles static interfaces demux0 unit "$junos-interface-unit" proxy-arp restricted
set dynamic-profiles static interfaces demux0 unit "$junos-interface-unit" demux-options underlying-interface "$junos-underlying-interface"
set dynamic-profiles static interfaces demux0 unit "$junos-interface-unit" family inet mac-validate strict
set dynamic-profiles static interfaces demux0 unit "$junos-interface-unit" family inet demux-source $junos-subscriber-ip-address
set dynamic-profiles static interfaces demux0 unit "$junos-interface-unit" family inet unnumbered-address lo0.0

Once subscriber with static configured address sent packet to mx, the dyn-ip subscriber will be created.

user@mx# run show subscribers
Interface             IP Address/VLAN ID                      User Name                      LS:RI
demux0.3221225487     192.168.0.2                                                       default:default
demux0.3221225488     192.168.0.3                                                       default:default

user@mx# run show subscribers extensive
Type: DYN-IP
IP Address: 192.168.0.2
Logical System: default
Routing Instance: default
Interface: demux0.3221225487
Interface type: Dynamic
Underlying Interface: xe-0/2/0.100
Dynamic Profile Name: static
MAC Address: 00:10:94:00:00:02
State: Active
Session ID: 20
PFE Flow ID: 66
VLAN Id: 100
Login Time: 2024-02-28 17:01:32 CST

Type: DYN-IP
IP Address: 192.168.0.3
Logical System: default
Routing Instance: default
Interface: demux0.3221225488
Interface type: Dynamic
Underlying Interface: xe-0/2/0.101
Dynamic Profile Name: static
MAC Address: 00:10:94:00:00:03
State: Active
Session ID: 21
PFE Flow ID: 68
VLAN Id: 101
Login Time: 2024-02-28 17:01:33 CST

user@mx# run show route 192.168.0.2
inet.0: 16 destinations, 16 routes (16 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.2/32     *[Access-internal/12] 00:13:32
                       Private unicast

user@mx# run show route 192.168.0.3
inet.0: 16 destinations, 16 routes (16 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.3/32     *[Access-internal/12] 00:13:35
                       Private unicast

Modification History

2024-02-28 : Article Created