The link should be connected either via a dedicated switch or by putting in a VLAN with no other hosts/devices, or by connecting a crossover Ethernet cable. In multiple context mode, the failover link needs to be on the system context (admin context). Figure
6-21 shows a configuration example.
Figure 6-21. LAN-Based Failover (Active/Standby)
[View full size image]
Note
Refer to Cisco documentation for additional failover configuration examples, such as LAN-based Active/Active:
http://www.cisco.com/en/US/products/ps6120/products_configuration_guide_chapter09186a008045247e.html#wp1046980
.
Asymmetric Routing Support (ASR)
The Active/Active mode additionally provisions the ASR (Asymmetric Routing Support) feature. The ASR technology allows the to forward the received packet for which it does not have an active connection by looking for a corresponding connection on other interfaces in the asynchronous routing group. In regular firewall mode, if the connection originates through one device, the ISP routes the return traffic through another device, the packet is dropped. ASR prevents the return packets from being
dropped in such environments. With the ASR feature, the connection information is forwarded to the secondary pair unit, and forward the traffic to the unit that holds the connection information.
Pages:
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327