Hello, I recently got my internet upgraded to 1Gbps and I also bought a new modem and when I connect my mac to the modem through the ethernet cable, my mac does not detect it. My modem's ethernet ports work perfect because I ran a speed test on my Xbox One and I'm getting full speed. I have tried several different ethernet cables and can not get my iMac to recognize the ethernet connection. I never had this problem with my older modem the ethernet port worked fine on my iMac. Would anyone be able to provide me with some help? Thank You
iMac, macOS High Sierra (10.13.5), iMac (27-inch, Late 2009)
- May 17, 2016 Oct 2 14: 32: 11.833 T4000 fpc2 XMCHIP (0): XXLCE0: Port Alarms: Detected Ethernet MAC Local Fault Delta Event for Port 0 (et-2 / 0 / 0) Oct 2 14: 32: 11.833 T4000 fpc2 T5E ( 2 / 0 ) link 00 down, localfault: yes, remotefault: no.
- Jun 01, 2018 For your wired MAC address, look for a section labeled 'Ethernet Adapter Local Network Connection.' There may be more than one Local Area Connection. If so they will be labeled Local Area Connection 2, Local Area Connection 3, etc. Your MAC address is labeled 'Physical Address', and is a 12 character alpha numeric string.
- Ethernet operates across two layers of the OSI model. The model provides a reference to which Ethernet can be related but it is actually implemented in the lower half of the Data Link layer, which is known as the Media Access Control (MAC) sublayer, and the Physical layer only.
- Sep 16 07:05:01.023 LOG: Info XMCHIP(0): XXLCE0: Port Alarms: Cleared Ethernet MAC Remote Fault Delta Event for Port 0 (et-11/0/0) NPC11(mate vty)# Thanks alot.
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I am facing a similar issue here with my mid-2009 13.3' Macbook Pro. All of a sudden, the Ethernet port stopped being responsive. I checked the Ethernet card and everything seems to be fine. Also, the port itself looks clean from the outside.
Unidirectional Link Detection (UDLD) is a data link layer protocol from Cisco Systems to monitor the physical configuration of the cables and detect unidirectional links. UDLD complements the Spanning Tree Protocol which is used to eliminate switching loops. Iridient for mac.
- Unidirectional Link Detection (UDLD) is one of two major features (UDLD and loop guard) in Cisco Switches to prevent Layer 2 loops.
- Spanning-Tree Protocol (STP) resolves redundant physical topology into a loop-free, tree-like forwarding topology via blocking one or more ports.
- In order to detect the unidirectional links before the forwarding loop is created, UDLD works by exchanging protocol packets between the neighboring devices.
- In order for UDLD to work, both switch devices on the link must support UDLD and have it enabled on respective ports.
Description[edit]
If two devices, A and B, are connected via a pair of optical fibers, one used for sending from A to B and other for sending from B to A, the link is bidirectional (two-way). If one of these fibers is broken, the link has become one-way or unidirectional. The goal of the UDLD protocol is to detect a broken bidirectional link (e.g. transmitted packets do not arrive at the receiver, or the fibers are connected to different ports).
What is pages and numbers for mac. For each device and for each port, a UDLD packet is sent to the port it links to. The packet contains sender identity information (device and port), and expected receiver identity information (device and port). Each port checks that the UDLD packets it receives contain the identifiers of his own device and port.
UDLD is a Cisco-proprietary protocol but HP, Extreme Networks, and AVAYA all have a similar feature calling it by a different name. HP calls theirs Device Link Detection Protocol (DLDP). Extreme Networks call it Extreme Link Status Monitoring (ELSM) and AVAYA calls theirs, Link-state Tracking.
Similar functionality in a standardized form is provided as part of the EthernetOAM protocol that is defined as part of the Ethernet in the First Mile changes to 802.3 (previously 802.3ah). D-Link has their DULD feature built on top of EthernetOAM function. Brocade devices running Ironware support a proprietary form of UDLD.
The use of UDLD over 10GbE is augmented, as per 802.3ae/D3.2 standard, when a fault is detected in the physical link:
- The local device signals local fault is signaled by PHY
- The local device ceases transmission of MAC frames and transmits remote fault
- The remote device receives remote fault and stops sending frames and continuously generates idle frames
External links[edit]
- Understanding and Configuring the Unidirectional Link Detection Protocol Feature at Cisco Systems
- '10Gig Link Fault Signaling Updated to IEEE Draft P802.3ae/D3.2'(pdf).
Port Alarms Detected Ethernet Mac Local Fault Delta Event For Port
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