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add-attribute-length-in-pdu

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 11.3.

Description

Add an extra byte in protocol data units (PDUs) sent by the Multiple VLAN Registration Protocol (MVRP) in Junos OS Releases 11.3 and later for EX Series switches that do not support the Enhanced Layer 2 Software (ELS). By default, this MVRP version does not include the extra byte. You can add the extra byte in this MVRP version to address an incompatibility issue with the following MVRP versions:

  • MVRP in Junos OS Releases 11.2 and earlier, which includes the extra byte.

  • MVRP in Junos OS Releases 13.2 and later for EX Series switches with support for ELS, which includes the extra byte.

If this incompatibility issue arises, the MVRP versions that include the extra byte do not recognize PDUs that do not include the extra byte.

You can recognize an MVRP version problem by looking at a switch running an MVRP version that includes the extra byte. Because a switch running an MVRP version that includes the extra byte cannot interpret an unmodified PDU from an MVRP version that does not include the extra byte, the switch will not add VLANs from the MVRP version that does not include the extra byte. When you execute the command show mvrp statistics on the MVRP version that includes the extra byte, the values for Join Empty received and Join In received will incorrectly display zero, even though the value for MRPDU received has been increased. Another indication that MVRP is having a version problem is that unexpected VLAN activity, such as multiple VLAN creation, takes place on the switch running the MVRP version that includes the extra byte.

Required Privilege Level

routing—To view this statement in the configuration.

routing control—To add this statement to the configuration.