--> VSS stands for Virtual Switching System.
--> VSS allows multiple physical catalyst switches of 4500 and 6500 series into one virtual switch.
--> VSS does this by combining two control planes of physical catalyst switches into one control plane.
--> VSS removes the need for using HSRP in the core network.
--> Configurations performed on one Switch in VSS is automatically synchronized with another switch automatically.
--> VSS automatically synchronizes the MAC tables and ARP Tables in both the configured switches to prevent asymmetric routing.
--> Convergence time is around 200 msec in VSS.
--> Access Layer Switches connect to both the switches by using one logical port channel.
--> VSS uses two types of chassis in order to work properly.
1) Active Chasis
--> Runs layer 2 and layer 3 routing protocols for both the switches.
--> Management is performed from this switch.
--> Performs Packet forwarding.
2) Standby Chasis
--> Performs Packet forwarding.
--> Sends all the control traffic to Active Chasis
--> In order to combine Two physical switches into one logical switch we need to establish the port
channel between two switches ( Virtual Switch Link).
Virtual Switch Link
--> Virtual Switch Link is a special link that carries the control and data traffic between two
physical switches.
--> Virtual Switch Link is implemented as EtherChannel between two chassis using up to 8 links.
--> Virtual Switch links gives priority to control traffic than data traffic so that control traffic
never be discarded.
--> All the commands on the interface are removed, when you configure Virtual Switch Link on it.
--> VSL link is only supported on 10 Gigabit Ethernet ports.
--> A new header is added to all the packets that are going via VSL link, and it is called the VS Header.
--> If Virtual Switch Link has failed between two chassis then the Standby chassis becomes as Active Chasis.
--> Once When failed Chasis recovers, it takes on the VSS standby role.
VSS DOMAIN
--> In order to create VSS, two 4500 or 6500 switches must be in the same VSS domain.
--> Domain ID number needs to be same on both the switches.
--> The domain ID can have a value ranging from 1 to 255.
--> The MAC address of the virtual system will be derived from the Domain ID.
--> If two connected VSS domains contain the same domain ID, the conflict will affect VSS operation.
Switch Identifier
--> Switch Identifier is used to identify the physical switch in Virtual Switching System.
--> The switch ID can be either 1 or 2 and must be unique on each member chassis.
--> This number is used as part of the interface naming to ensure that the interface name remains the same regardless of the virtual switch role ( Active or Standby).
Redundancy Modes
--> There are three modes of redundancy,
1) RPR
2) RPR+
3) SSO
--> For more information, check my post on supervisory redundancy modes from here
http://networkingmaterials.blogspot.com/2018/09/what-is-supervisor-redundancy.html
Configuration
S1: Create a Virtual Switch Domain on both the switches and switch identifier numbers
Switch1(config)#switch virtual domain 10
Switch1(config-vs-domain)# Switch 1
Switch2(config)#switch virtual domain 10
Switch2(config-vs-domain)# Switch 2
S2: Configure the Priority to make SW1 as Active Chasis and SW2 as Standby Chasis.
Switch1(config)#switch virtual domain 10
Switch1(config-vs-domain)# Switch 1 priority 110
Switch1(config-vs-domain)# Switch 2 priority 100
Switch2(config)#switch virtual domain 10
Switch2(config-vs-domain)# Switch 1 priority 110
Switch2(config-vs-domain)# Switch 2 priority 100
Note: The Switch with the highest priority becomes the active switch.
S3: Create Virtual Switch Link between two Switches by using port channel.
Switch1(config)# interface port-channel 1
Switch1(config-if)# no shutdown
Switch1(config-if)# switch virtual link 1
Switch1(config-if)#exit
Switch1(config)#int range ten 5/4- 5
Switch1(config-if-range)#channel-group 1 mode on
Switch1(config-if-range)#no shut
Switch2(config)# interface port-channel 2
Switch2(config-if)# no shutdown
Switch2(config-if)# switch virtual link 2
Switch2(config-if)#exit
Switch2(config)#int range ten 5/4- 5
Switch2(config-if-range)#channel-group 2 mode on
Switch2(config-if-range)#no shut
S4: Implement Virtual Switching System on both the Switches.
Switch1(config)# switch convert mode virtual
Switch2(config)# switch convert mode virtual
Ref: Cisco.com
MD.Kareemoddin
CCIE # 54759
--> VSS allows multiple physical catalyst switches of 4500 and 6500 series into one virtual switch.
--> VSS does this by combining two control planes of physical catalyst switches into one control plane.
--> VSS removes the need for using HSRP in the core network.
--> Configurations performed on one Switch in VSS is automatically synchronized with another switch automatically.
--> VSS automatically synchronizes the MAC tables and ARP Tables in both the configured switches to prevent asymmetric routing.
--> Convergence time is around 200 msec in VSS.
--> Access Layer Switches connect to both the switches by using one logical port channel.
--> VSS uses two types of chassis in order to work properly.
1) Active Chasis
--> Runs layer 2 and layer 3 routing protocols for both the switches.
--> Management is performed from this switch.
--> Performs Packet forwarding.
2) Standby Chasis
--> Performs Packet forwarding.
--> Sends all the control traffic to Active Chasis
--> In order to combine Two physical switches into one logical switch we need to establish the port
channel between two switches ( Virtual Switch Link).
Virtual Switch Link
--> Virtual Switch Link is a special link that carries the control and data traffic between two
physical switches.
--> Virtual Switch Link is implemented as EtherChannel between two chassis using up to 8 links.
--> Virtual Switch links gives priority to control traffic than data traffic so that control traffic
never be discarded.
--> All the commands on the interface are removed, when you configure Virtual Switch Link on it.
--> VSL link is only supported on 10 Gigabit Ethernet ports.
--> A new header is added to all the packets that are going via VSL link, and it is called the VS Header.
--> If Virtual Switch Link has failed between two chassis then the Standby chassis becomes as Active Chasis.
--> Once When failed Chasis recovers, it takes on the VSS standby role.
VSS DOMAIN
--> In order to create VSS, two 4500 or 6500 switches must be in the same VSS domain.
--> Domain ID number needs to be same on both the switches.
--> The domain ID can have a value ranging from 1 to 255.
--> The MAC address of the virtual system will be derived from the Domain ID.
--> If two connected VSS domains contain the same domain ID, the conflict will affect VSS operation.
Switch Identifier
--> Switch Identifier is used to identify the physical switch in Virtual Switching System.
--> The switch ID can be either 1 or 2 and must be unique on each member chassis.
--> This number is used as part of the interface naming to ensure that the interface name remains the same regardless of the virtual switch role ( Active or Standby).
Redundancy Modes
--> There are three modes of redundancy,
1) RPR
2) RPR+
3) SSO
--> For more information, check my post on supervisory redundancy modes from here
http://networkingmaterials.blogspot.com/2018/09/what-is-supervisor-redundancy.html
Configuration
S1: Create a Virtual Switch Domain on both the switches and switch identifier numbers
Switch1(config)#switch virtual domain 10
Switch1(config-vs-domain)# Switch 1
Switch2(config)#switch virtual domain 10
Switch2(config-vs-domain)# Switch 2
S2: Configure the Priority to make SW1 as Active Chasis and SW2 as Standby Chasis.
Switch1(config)#switch virtual domain 10
Switch1(config-vs-domain)# Switch 1 priority 110
Switch1(config-vs-domain)# Switch 2 priority 100
Switch2(config)#switch virtual domain 10
Switch2(config-vs-domain)# Switch 1 priority 110
Switch2(config-vs-domain)# Switch 2 priority 100
Note: The Switch with the highest priority becomes the active switch.
S3: Create Virtual Switch Link between two Switches by using port channel.
Switch1(config)# interface port-channel 1
Switch1(config-if)# no shutdown
Switch1(config-if)# switch virtual link 1
Switch1(config-if)#exit
Switch1(config)#int range ten 5/4- 5
Switch1(config-if-range)#channel-group 1 mode on
Switch1(config-if-range)#no shut
Switch2(config)# interface port-channel 2
Switch2(config-if)# no shutdown
Switch2(config-if)# switch virtual link 2
Switch2(config-if)#exit
Switch2(config)#int range ten 5/4- 5
Switch2(config-if-range)#channel-group 2 mode on
Switch2(config-if-range)#no shut
S4: Implement Virtual Switching System on both the Switches.
Switch1(config)# switch convert mode virtual
Switch2(config)# switch convert mode virtual
Ref: Cisco.com
MD.Kareemoddin
CCIE # 54759
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