Another VLAN Question - Real World Query

[nethack]

Hi,

Some basic information about VLAN is VTP is using as a communication protocol to synchronous VLAN database in betweeen VTP server and clients so, the VLAN database will be updated in all switches in the same Domain. My question is related to SVI. If I created a VLAN in Server it will update in all switches. Sure, we need to add port in each switch to specific VLAN. We cannot do that from server to all other switches. Again,If I created an SVI ( interface vlan 100, ip address 192.168.100.254 255.255.255.0 , no shutdown) in Switch 1 ( which is in server mode)as there is trunk port in between all switches, any PC connecting to VLAN 100 port in any switch can reach this IP address. Here is my doubt. If Switch 1 is goes down, what will happen, will other switches have the SVI with the same IP addresses?

As my Servers will be having two Interfaces and will be connected to both switches, I want to have the same Gateway should be used for the both Interfaces in Servers. Also, in case one switch goes down another should provide routing. It means that both must have SVI with same IP addresses. How can I achieve this. Is my VLAN concept is not clear? what about HSRP, What about stacking switches

Thanks for help
0

[polio]

Hi,

your're right, gateway redundancy is needed to achieve this. These protocols use a common IP address among different gateways, to make it transparent to the end devices. Let's say Switch 1 has a (physical) IP address of 10.0.0.2 and Switch 2 ha 10.0.0.3 . They form a "gateway group" for e.g. Vlan100 with a virtual address of 10.0.0.1 . The end devices don't care what is the actual gateway, they'll use 10.0.0.1 for default gateway.

Here's an article on HRSP: hxxp://www.cisco.com/en/US/docs/internetworking/case/studies/cs009.html