Cisco Layer 2 device SWITCH detailed and hot backup
SWITCH Layer 2 device
Basic functions of the Switch:
1. Learn mac address (deleting mac header)
2. Forward Ethernet frames
3. Prevent loops
Switch principle:
1. Learning based on source mac address
2. Forward based on destination mac address
3. Multiple MAC addresses can be learned on the same interface.
4. The same mac address is learned by multiple interfaces, and the interface learned after the selection (the mac address table is prioritized)
5. For frames that do not have a destination mac address entry (this frame is called unknown unicast), forward to all other interfaces of the machine.
6. Receive the wide/multicast frame and forward it to all other interfaces of the machine.
Each switch maintains a mac address table, which stores the mapping of learned mac addresses and interfaces.
The Mac address table is also called the Cam table and contains three elements:
VLAN
2. Mac address
3. Port number
S show mac-address-table {interface f0/1}
S show version //You can see the backplane mac of the Switch
S show int f0/0 //View the mac address of the physical interface
S show int vlan 1 //View the mac address of the SVI interface
S clear mac address-table //clear mac address table
The default dynamic MAC address entry aging time is 300s. You can modify this aging time—you can change it for a single VLAN.
S show mac-address-table aging-time //View aging time
S(config) mac-address-table aging-time 150 vlan 1 //Some versions do not have this command
S(config) mac-address-table static 001c.0af2.1342 vlan 1 interface f0/1
/ / Static configuration mac address
note:
Each Switch has a reference mac address that will be used when running the STP protocol.
Each interface of the Switch also has a mac address, which is equal to the reference mac address plus the interface.
Traditional Ethernet network issues:
1. Look at the broadcast and unknown unicast flooding
2. Lack of the most basic security
3. Any node failure will affect all networks （ccda 200 310 dumps）
Hot backup: configure two gateways, one of which is down, switch 1
R2(config-if) standby X ip x.x.x.x // Interface 0/0 under R2, X is the standby group number, x.x.x.x: standby.0 group virtual ip, same interface with interface ip
R2(config-if) standby X priority 120 //Configure priority, default 100
R2(config-if) standby X preempt //Open preemption
R2(config-if) standby X track f1/0 50 //Detect the external interface of f1/0. If a fault occurs, the priority is reduced by 50.
R3(config-if) standby X ip x.x.x.x //The interface below R3 is the same as the R2 virtual IP
PC ip default-gateway x.x.x.x //x.x.x.x virtual ip"
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Basic functions of the Switch:
1. Learn mac address (deleting mac header)
2. Forward Ethernet frames
3. Prevent loops
Switch principle:
1. Learning based on source mac address
2. Forward based on destination mac address
3. Multiple MAC addresses can be learned on the same interface.
4. The same mac address is learned by multiple interfaces, and the interface learned after the selection (the mac address table is prioritized)
5. For frames that do not have a destination mac address entry (this frame is called unknown unicast), forward to all other interfaces of the machine.
6. Receive the wide/multicast frame and forward it to all other interfaces of the machine.
Each switch maintains a mac address table, which stores the mapping of learned mac addresses and interfaces.
The Mac address table is also called the Cam table and contains three elements:
VLAN
2. Mac address
3. Port number
S show mac-address-table {interface f0/1}
S show version //You can see the backplane mac of the Switch
S show int f0/0 //View the mac address of the physical interface
S show int vlan 1 //View the mac address of the SVI interface
S clear mac address-table //clear mac address table
The default dynamic MAC address entry aging time is 300s. You can modify this aging time—you can change it for a single VLAN.
S show mac-address-table aging-time //View aging time
S(config) mac-address-table aging-time 150 vlan 1 //Some versions do not have this command
S(config) mac-address-table static 001c.0af2.1342 vlan 1 interface f0/1
/ / Static configuration mac address
note:
Each Switch has a reference mac address that will be used when running the STP protocol.
Each interface of the Switch also has a mac address, which is equal to the reference mac address plus the interface.
Traditional Ethernet network issues:
1. Look at the broadcast and unknown unicast flooding
2. Lack of the most basic security
3. Any node failure will affect all networks （ccda 200 310 dumps）
Hot backup: configure two gateways, one of which is down, switch 1
R2(config-if) standby X ip x.x.x.x // Interface 0/0 under R2, X is the standby group number, x.x.x.x: standby.0 group virtual ip, same interface with interface ip
R2(config-if) standby X priority 120 //Configure priority, default 100
R2(config-if) standby X preempt //Open preemption
R2(config-if) standby X track f1/0 50 //Detect the external interface of f1/0. If a fault occurs, the priority is reduced by 50.
R3(config-if) standby X ip x.x.x.x //The interface below R3 is the same as the R2 virtual IP
PC ip default-gateway x.x.x.x //x.x.x.x virtual ip"
If you want to passed the exam successfully. you can review with ccde 352 001 dumps from evedumps.com that will help passed exam at first attempt. I will also recommend the ccdp 300 320 exam dumps too.
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