02.10.2013 Views

FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Figure 112 Server Clustering: Multiple ARP Replies<br />

Microsoft Server Cluster:<br />

Figure 113 Server Clustering: Failover and Balancing Not Preserved<br />

Microsoft Server Cluster:<br />

IP Cluster<br />

MAC Cluster<br />

IP Cluster<br />

MAC Cluster<br />

Server1:<br />

MACS1<br />

IP S1<br />

Server2:<br />

IP<br />

S2<br />

MAC<br />

S2<br />

IP<br />

Server3: S3<br />

MAC<br />

S3<br />

IP<br />

Server3: S4<br />

MAC<br />

S4<br />

Server1:<br />

MACS1<br />

IP S1<br />

Server2:<br />

IP<br />

S2<br />

MAC<br />

S2<br />

IP<br />

Server3: S3<br />

MAC<br />

S3<br />

IP<br />

Server3:<br />

S4<br />

MAC<br />

S4<br />

Source MAC: MAC<br />

S1<br />

Destination MAC: MAC<br />

Client<br />

Type: 0x0806<br />

Last ARP Reply<br />

Configuring <strong>the</strong> Switch <strong>for</strong> Microsoft Server Clustering<br />

To preserve failover and balancing, <strong>the</strong> <strong>Force10</strong> switch must learn <strong>the</strong> cluster’s virtual MAC address, and<br />

it must <strong>for</strong>ward traffic destined <strong>for</strong> <strong>the</strong> server cluster out all member ports in <strong>the</strong> VLAN connected to <strong>the</strong><br />

cluster. To ensure that this happens, you must configure <strong>the</strong> command vlan-flooding on <strong>the</strong> <strong>Force10</strong><br />

switch at <strong>the</strong> time that <strong>the</strong> Microsoft cluster is configured (Figure 114).<br />

As shown in Figure 114, <strong>the</strong> server MAC address is given in <strong>the</strong> E<strong>the</strong>rnet frame header of <strong>the</strong> ARP reply,<br />

while <strong>the</strong> virtual MAC address representing <strong>the</strong> cluster is given in <strong>the</strong> payload. The vlan-flooding<br />

command directs <strong>the</strong> system to discover that <strong>the</strong>re are different MAC addresses in an ARP reply and<br />

associate <strong>the</strong> virtual MAC address with <strong>the</strong> VLAN connected to <strong>the</strong> cluster. Then, all traffic destined <strong>for</strong><br />

<strong>the</strong> cluster is flooded out of all member ports. Since all of <strong>the</strong> servers in <strong>the</strong> cluster receive traffic, failover<br />

and balancing are preserved.<br />

204 Layer 2<br />

VLAN 1<br />

Source IP: IP<br />

S1<br />

Source MAC: MAC<br />

Cluster<br />

E<strong>the</strong>rnet Frame Header ARP Reply<br />

VLAN 1<br />

Data<br />

Pad CRC<br />

Client<br />

fnC0027mp<br />

Client<br />

fnC0028mp

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!