Migrating from Cisco to Juniper


Off late there has been a lot of migration from the traditional Cisco oriented networks to Juniper and Alcatel Lucent. Big organizations have migrated from Cisco to Juniper / Alcatel Lucent respectively and the bidding prices for these projects is between 10-100 millions. However deciding factor for these projects was not price alone but the offerings which Juniper and ALU have in comparison to Cisco.
Some of the nodes which have been replaced are
Cisco 6509 to Juniper EX8200
Cisco 3750 to Juniper 3750
Cisco ASR 9K to Juniper MX960
Cisco Nexus 7000 – Juniper 8200 (Strange?)
We’ll I have been a part of migration from Cisco to Juniper for our access and MPLS core ,so could note down certain things which we had to keep in mind for migration preparation.


1.Use the IOS to JUNOS translator (I2J) tool for converting full IOS configuration files into Juniper JUNOS format –This could save a lot of time if you have a large volume, however the tool still throws up some errors and may point you where manual changes may be required. Also interface mapping is required from corresponding to Cisco.


2. Connectivity issues in layer 2 trunk ports between Cisco and Juniper comes up, when Cisco has UDLD configured at its end .So generally disabling UDLD at the B end cisco device access or distribution layer switch may be required in Juniper/Cisco mixed scenarios. Continue reading “Migrating from Cisco to Juniper”