Category: LAN General
MAC address format convert with excel
Format : 001122334455 -> 00:11:22:33:44:55 From MS Excel, 1. Put a raw MAC address : ex) 001122334455 on A1 2. Copy and paste…
Ethernet frame and MTU
Here is story about MTU. 1. Etherent frame size (without 802.1q) = 1518 Bytes Destination mac(6) + source MAC(6) + type(2) + data(1500) +…
How to find network card vendor by OUI lookup/MAC address
Tweet When you are troubleshooting an issue and need to identify device, OUI lookup is big help. OUI is first 24 bit of MAC address…
How to capture traffic using VACL
Tweet VLAN ACL can be used to capture live traffic (same as SPAN) 1. Create Access Map 2. Apply Capture Cisco_VACL_Capture# conf t…
How to configure IRB(Integrated Routing and Bridging)
Tweet [ Backgroud ] PC1 is connected to Fa0/0(no IP address, bridge) of Router = IP 10.10.10.1/24 PC2 is connected to Fa0/1(no IP address, bridge)…
Ethernet speed and duplex configuration
Tweet Speed mismatching issues may result in no connectivity. However, issues withauto-negotiation of duplex generally do not result in link establishment issues. Instead, auto-negotiation issues…
What is UDLD protocol ?
Tweet In order to detect the unidirectional links before the forwarding loop is created, Cisco designed and implemented the UDLD protocol. UDLD is a Layer…
Ethernet Cable Guide
Tweet UTP(Unshielded Twisted Pair) Cable Cat3, Cat5, Cat5e, Cat6 Weakness on Electromagnetic Interference(EMI) Installation Guide – Avoid direct sunshine and humidity – Enough distance from device…
How to read Cisco FastEthernet Interface status
Tweet Sometimes, by looking over some basic or fundamental information during troubleshooting, we got wrong path and wasted hack of time. If you carefully reviewed…
Many “runts” are being detect on Ethernet interface ?
Tweet Question: Many “runts” are being detect on Ethernet interface ? Answer: It could be duplex mismatching issue. First of call, Runts: These are…
What is Alignment Errors ?
Tweet Question : What is Alignment Errors ? Answer: I found the below information on Internet…. Alignment errors are a count of the number…
What is standard Ethernet frame size and MTU ?
Tweet Question: What is standard Ethernet frame size and MTU ? Answer: In my knowledge(not from Internet) Preamble is not calculated in frame size…
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