Tim's Technology Journey Wiki

VSS

Has to be L3 connectivity between switches using default route table. Hostnames must be unique. #switch convert mode easy-virtual-switch (easy-vss)# VSL ?

Creating L3 Connectivity

SwA(config-if)# no switchport
SwA(config-if)# ip add 10.5.5.6 255.255.255.0

SwB(config-if)# no switchport
SwB(config-if)# ip add 10.5.5.5 255.255.255.0

# switch convert easy-virtual-switch
# show cdp tlv app g2/4
	check for tlv type: 4103 - means CDP-VSS_DISCOVERY message was received.
(easy-vss)# VSL g3/4 g3/5

The switch to which these interfaces are connected becomes the standby switch. The master and standby switches communicate using socket messages over a L3 port.

The master and standby switches open UDP port 5500 for socket communication.
The master switch sends a VSS request message to the standby switch with the following information:
	Network bootable image path, chosen interfaces, port channel used by the master, and some additional checks.
The master switch finds and uses the last unused port channel for the VSL port channel.
Upon receiving the VSS request message, the standby switch records the VSL interfaces.
The standby switch records the image path, allocates the last unused port channel, which is not the same port channel allocated by the master switch.
The standby switch sends a VSS response message acknowledging the configuration that is sent by the master switch and automatically reboots with the image path provided by the master switch.
Upon receiving the VSS response message, the master switch automatically reboots.
Both master and standby switches reboot in the VSS.

Advantages

A single command is executed on the master switch.
Zero touch standby.
Image incompatibility addressed in standby by auto-image-download.
Much less error-prone.
No need to check connectivity because the CLI displays all options.
Implementation is not platform specific and can be extended to other similar platforms like the Cisco Catalyst 6000 Series switches.

IVR Configuring Inter-VLAN Routing

R1(config)# int e0/0.10 R1(configif)# encap dot1q 10 R1(configif)# ip add 10.0.10.1 255.255.255.0

R1(config)# int e0/0.20 R1(configif)# encap dot1q 20 R1(configif)# ip add 10.0.20.1 255.255.255.0

R1(config)# int e0/0.1 R1(configif)# encap dot1q 1 native R1(configif)# ip add 10.0.1.1 255.255.255.0

Sw1(config)# int e0/0 Sw1(configif)# switchport trunk encap dot1q Sw1(configif)# switchport mode trunk Sw1(configif)# switchport trunk allowed vlan 1,10,20

show interfaces e0/0 switchport

SVI Switch Virtual Interfaces DSW1(config)# vlan 10 DSW1(config)# vlan 20 DSW1(config)# ip routing DSW1(config)# int vlan 10 DSW1(config-if)# desc connection to VLAN 10 DSW1(config-if)# ip add 10.0.10.1 255.255.255.0 DSW1(config-if)# no shut DSW1(config)# int vlan 20 DSW1(config-if)# desc connection to VLAN 20 DSW1(config-if)# ip add 10.0.20.1 255.255.255.0 DSW1(config-if)# no shut DSW1(config)# int e0/2 DSW1(config-if)# desc connection to router DSW1(config-if)# no switchport DSW1(config-if)# ip add 10.0.99.1 255.255.255.0 DSW1(config)# router eigrp 1 DSW1(config-router)# net 10.0.0.0 show ip route ***

SVI Autostate Exclude Command

Remove the binding to an interface's up/up calculations

Sw1(config)# int f0/1 Sw1(config-if)# switchport auto-state exclude

Use on non-mission critical ports