Description

Traffic has been sent to vlan interface but ipdemux hasn't received it.

This issue looks like ipdemux interface filter doesn't work, the traffic has been forwarded by vlan interface.

Symptoms

Dhcp subscriber login and created ipdemux interface:

user@mx# run show subscribers extensive
Type: DHCP
User Name: dhcp
IP Address: 192.168.0.2
IP Netmask: 255.255.0.0
Primary DNS Address: 10.0.0.1
Secondary DNS Address: 10.0.0.2
Logical System: default
Routing Instance: default
Interface: demux0.3221225472  
Interface type: Dynamic
Underlying Interface: xe-0/2/0.100
Dynamic Profile Name: ipdemux-profile
MAC Address: 00:10:94:00:00:04
State: Active
Radius Accounting ID: 1
Session ID: 1
PFE Flow ID: 33
VLAN Id: 100
Login Time: 2024-04-01 10:42:28 CST
DHCP Options: len 53
35 01 01 39 02 02 40 3d 07 01 00 10 94 00 00 04 33 04 00 00
00 3c 0c 15 63 6c 69 65 6e 74 5f 50 6f 72 74 20 2f 2f 31 2f
31 2d 30 2d 30 37 06 01 03 06 0f 21 2c
DHCP Header: len 44
01 01 06 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 10 94 00 00 04 00 00 00 00 00 00
00 00 00 00
IP Address Pool: dhcpv4
IPv4 Input Filter Name: 10m-demux0.3221225472-in
IPv4 Output Filter Name: 10m-demux0.3221225472-out
Accounting interval: 600
Dynamic configuration:
 junos-input-filter: 10m
 junos-output-filter: 10m

 


Traffic has been sent to vlan: 
user@mx# run show interfaces xe-0/2/0.100 extensive | match pps
   Input packets:         1655          10 pps 
   Output packets:           0          0 pps

But ipdemux interface has not received it: 
user@mx# run show interfaces demux0.3221225472 extensive | match pps
   Input packets:           0          0 pps   
   Output packets:          0          0 pps

Solution

This issue could be caused by demux source has not configured on vlan interface.

There are two methods  adding demux source, only one can take effect.
If configured two knobs at same time, commit check will report error.

For static vlan:

1.#set interfaces xe-0/2/0 unit 100 demux-source inet
2.#set interfaces xe-0/2/0 unit 100 demux inet address source

For dynamic vlan:

1.#set dynamic-profiles vlan-profile interfaces "$junos-interface-ifd-name" unit "$junos-interface-unit" demux-source inet
2.#set dynamic-profiles vlan-profile interfaces "$junos-interface-ifd-name" unit "$junos-interface-unit" demux inet address source

 

After modified configuration, dhcp subscriber needs to redial and let new configuration take effect.

user@mx# run show subscribers extensive
Type: DHCP
User Name: dhcp
IP Address: 192.168.0.3
IP Netmask: 255.255.0.0
Primary DNS Address: 8.8.8.8
Secondary DNS Address: 8.8.4.4
Logical System: default
Routing Instance: default
Interface: demux0.3221225473
Interface type: Dynamic
Underlying Interface: xe-0/2/0.100
Dynamic Profile Name: ipdemux-profile
MAC Address: 00:10:94:00:00:04
State: Active
Radius Accounting ID: 2
Session ID: 2
PFE Flow ID: 35
VLAN Id: 100
Login Time: 2024-04-01 10:49:05 CST
DHCP Options: len 53
35 01 01 39 02 02 40 3d 07 01 00 10 94 00 00 04 33 04 00 00
00 3c 0c 15 63 6c 69 65 6e 74 5f 50 6f 72 74 20 2f 2f 31 2f
31 2d 30 2d 30 37 06 01 03 06 0f 21 2c
DHCP Header: len 44
01 01 06 00 00 00 00 02 00 00 80 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 10 94 00 00 04 00 00 00 00 00 00
00 00 00 00
IP Address Pool: dhcpv4
IPv4 Input Filter Name: 10m-demux0.3221225473-in
IPv4 Output Filter Name: 10m-demux0.3221225473-out
Accounting interval: 600
Dynamic configuration:
 junos-input-filter: 10m
 junos-output-filter: 10m

 

Traffic has been sent to ipdemux interface:

user@mx# run show interfaces demux0.3221225473 extensive | match pps
   Input packets:         904          10 pps 
   Output packets:          0          0 pps

 

Modification History

2024-04-01 : Article Created