udld mode

Syntax

udld mode aruba-os {verify-then-forward | forward-then-verify}

udld mode rfc5171 <RFC5171-MODE>

no udld mode

Description

Sets the operating mode.

The no form of this command sets the operating mode to the default value of aruba-os and forward-then-verify.

Command context

config-if

Parameters

aruba-os {verify-then-forward | forward-then-verify}

Selects the ArubaOS mode to use. Use this mode when interconnecting with HPE PVOS/Brocade/Foundry switches.

verify-then-forward
In this mode:
  • Interfaces start as unblocked.

  • Once an interface is determined to be bidirectional, it is blocked if the retry limit is reached without receiving any UDLD packets.

  • Interfaces automatically unblock if a UDLD packet is received.

  • On failover, the UDLD state does not change if the (interval * retries) time is around 6 seconds.

forward-then-verify
In this mode:
  • Interfaces start as unblocked.

  • Interfaces transition to the unblocked state when receiving UDLD packets.

  • Once an interface is determined to be bidirectional, it is blocked if the retry limit is reached without receiving any UDLD packets.

  • Interfaces automatically unblock if a UDLD packet is received.

rfc5171 <RFC5171-MODE>

Selects the RFC5171 mode to use. Use this mode when interconnecting with third-party switches.

normal
In this mode:
  • Interfaces start as unblocked.

  • Interfaces do not block when the retry limit is reached without receiving any UDLD packets (plus 8 extra packets sent to the peer). Instead, an event is generated.

  • Interfaces automatically unblock if a UDLD packet is received.

aggressive
In this mode:
  • Interfaces start as unblocked.

  • Once an interface is determined to be bidirectional, an interface will block when the retry limit is reached without receiving any UDLD packets (plus 8 extra packets sent to the peer).

  • Interfaces are not automatically unblocked when a UDLD packet is received. The only way to unblock the interface in this mode is to disable (and optionally re-enable) UDLD on the interface.

Authority

Administrators

Examples

Setting the operating mode to aruba-os and forward-then-verify on interface 1/1/1:

switch(config)# interface 1/1/1
switch(config-if)# udld mode aruba-os forward-then-verify

Setting the operating mode to rfc5171 and aggressive on interface 1/1/1:

switch(config)# interface 1/1/1
switch(config-if)# udld mode rfc5171 aggressive

Setting the operating mode on interface 1/1/1 to the default value:

switch(config)# interface 1/1/1
switch(config-if)# no udld mode