Object
Juniper VLAN Number Rewrite is very useful when you are executing a network transition project, scenarios can be you are trying to use the same subnets on both new and old environments, or the ISP gives you a VLAN number that overlaps your VLAN number in your current network.
Solution
The below example shows how to rewrite/translate the VLAN number 4 coming from Cisco devices (source) into VLAN 1 on Juniper devices (destination).
On Cisco Catalyst:
conf t
interface gi1/0/1
switchport mode trunk
switchport trunk allowed vlan 2,4
On Juniper EX:
set interfaces ge-0/0/4 description *to Cisco switch*
set interfaces ge-0/0/4 unit 0 family ethernet-switching interface-mode trunk
set interfaces ge-0/0/4 unit 0 family ethernet-switching vlan members 1
set interfaces ge-0/0/4 unit 0 family ethernet-switching vlan members 2
set interfaces ge-0/0/4 unit 0 family ethernet-switching vlan-rewrite translate 4 1
The last line “vlan-rewrite translate 4 1” did the trick, VLAN 4 is the incoming VLAN, and VLAN 1 is the VLAN being translated into.
Useful Links:
[EX/QFX] Example – Configuring VLAN translation by using ELS on Junos OS – Juniper
https://kb.juniper.net/InfoCenter/index?page=content&id=KB32859&actp=RSS
Ethernet Switching User Guide – vlan-rewrite
Thanks for sharing.
I hope this will help.
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