Extreme-Dynamic-Config

This VSA configures port and VLAN based attributes.

• Name: Extreme-Dyn-Config​

• Value: 252​

• Type: String​

• Vendor: Extreme​

• Extreme Vendor ID is 1916​

The following features can be configured using Extreme-Dynamic-Config RADIUS VSA:

• VLAN-based features:

  • DHCP Snooping

  • Dynamic ARP Inspection (DAI)

  • IGMP Snooping

• Port-based features:

  • Custom Auto-Negotiation Advertisements (CANA)

  • Bridge Protocol Data Unit (BPDU) Guard

  • IP Source Guard (IPSG)

  • Port bounce

  • Reauthentication

  • Simple Loop Prevention Protocol (SLPP) Guard

  • Traffic Control (Wake on LAN - WoL)

Note

If you use the Extreme-Dynamic-Config RADIUS VSA, then Dynamic ARP Inspection and DHCP Snooping are only enabled on the default VLAN if IPSG is present in the RADIUS attributes.

AN-ADVERTISMENTS:100Half or AN-ADVERTISMENTS:100H

AN-ADVERTISMENTS:100Half or AN-ADVERTISMENTS:100H settings configure CANA speed and duplex to the following supported values:

• 10Half

• 100Full

• 100Half

• 100Full

• 1000Full

BPDU

This attribute enables BPDU Guard on the port where the client resides.

DAI

This attribute enables DAI on the VLAN received from the RADIUS server. For a Flex-UNI port, DAI is enabled on the platform VLAN associated with the I-SID received from the RADIUS server.

DAI is also enabled on the default VLAN of the port to prepare for IPSG, which requires DAI and DHCP Snooping enabled on all VLANs. If the RADIUS server does not return a VLAN of I-SID, DAI is enabled on the default VLAN. For Flex-UNI ports, DAI is enabled on the platform VLAN associated with the untagged I-SID.

Note

If you use the Extreme-Dynamic-Config RADIUS VSA, then DAI is only enabled on the default VLAN if IPSG is present in the RADIUS attributes.

DHCPSNOOP

This attribute enables DHCP Snooping on the VLAN received from the RADIUS server. For a Flex-UNI port, DHCP Snooping is enabled on the platform VLAN associated with the I-SID received from the RADIUS server.

DHCP Snooping is also enabled on the default VLAN of that port to prepare for IPSG, which requires DAI and DHCP Snooping enabled on all VLANs. If the RADIUS server does not return a VLAN of I-SID, DHCP Snooping is enabled on the default VLAN. For Flex-UNI ports, DHCP Snooping is enabled for the platform VLAN associated with the untagged I-SID.

Note

If you use the Extreme-Dynamic-Config RADIUS VSA, then DHCP Snooping is only enabled on the default VLAN if IPSG is present in the RADIUS attributes.

IGMPSNOOP

This attribute enables IGMP Snooping on the VLAN received from the RADIUS server. For a Flex-UNI port, IGMP Snooping is enabled on the platform VLAN associated with the I-SID received from the RADIUS server.

IPSG

This attribute enables IPSG on the port where the client resides.

In order to apply IPSG, DHCP Snooping and DAI must be configured on the RADIUS server. DHCP Snooping and DAI must be enabled on all VLANs.

The following is an example of a log message that displays if a setting is not configured correctly:

PORTBOUNCE

This attribute runs a port bounce on an EAP port including Power over Ethernet (PoE), if capable. Current EAP sessions are preserved during the port bounce process.

Use this attribute for on-demand re-authentication, for example, to use a power cycle to trigger a port bounce for a PC behind a phone, which is being rebooted, as in the following use cases:

• To ensure a PC behind a phone acquires an IP address from the VLAN or I-SID assigned by the RADIUS server, the PC triggers a new DHCP negotiation if it receives the port-bounce attribute in the RADIUS-Accept packet.

• To force a client to renew its DHCP IP address by using a RADIUS dynamic Change-of-Authorization (CoA) or Disconnect request.

CLI and EDM output that displays the interface state indicates if a port is down because of a RADIUS VSA port bounce.

REAUTH or REAUTH:100

This attribute enables EAPOL reauthentication on a port either manually using CLI or dynamically through RADIUS. The origin identifies how reauthentication was configured, either CONFIG or RADIUS.

SLPPGUARD

This attribute enables SLPP Guard on the port where the client resides.

WOL

This attribute enables EAP traffic-control (Wake On LAN) on the port where the client resides.

Session Timeout and Reauthentication VSA Behavior

Expected Behavior for DHCP Snooping and DAI Vendor Specific Attributes

The following table shows the behavior for Dynamic Host Configuration Protocol Snooping (DHCP Snooping) and Dynamic ARP Inspection (DAI) Vendor Specific Attributes (VSA) for each authentication scenario, depending on Extensible Authentication Protocol (EAP) Operational mode, Flex-UNI mode, and IP Source Guard (IPSG) VSA or RADIUS VLAN/ISID.