Cisco 6503 White Paper page 15

The same IP and Media Access Control (MAC) addresses are used for the designated router, whether or not the MSFC is the
designated router. The MSFC that is chosen as the designated router will communicate its default MAC address to the MSFC
that is the nondesignated router. All subsequent interfaces created on the nondesignated router use this MAC address, unless
the user explicitly configures a different MAC address.
On bootup the two MSFCs perform a "handshake" process, which takes about a minute, before entering SRM mode.
Important: Do not make configuration changes on the nondesignated router during the handshake process.
The following commands can be used to verify that SRM is enabled:
SRM# show redundancy
Designated Router: 1 Non-designated Router: 2
Redundancy Status: designated
Config Sync AdminStatus : enabled
Config Sync RuntimeStatus: enabled
Single Router Mode AdminStatus : enabled
Single Router Mode RuntimeStatus: enabled
Single Router Mode transition timer : 120 seconds
For more details about configuring SRM, see section "MSFC Redundancy–Single Router Mode Redundancy" in the Cisco
Catalyst OS configuration guide at:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_6_3/confg_gd/redund.htm
WAN Interfaces in SRM
Because the MSFC configurations are synchronized as an inherent part of SRM, all OSMs and FlexWAN WAN modules are
supported with redundant supervisor engines or MSFCs configured for SRM. As in DRM, the designated router manages the
WAN interfaces. The interfaces are configured completely on the designated router and that configuration is synchronized to
the nondesignated router. For failover scenarios, the new designated router will take ownership of the WAN interfaces as soon
as that MSFC becomes the designated router. Additionally, the WAN modules should not reload upon a high-availability
switchover. With SRM enabled, there is no manual configuration necessary on the WAN interfaces to support an MSFC
failover.
SRM Configuration and Conversion Procedure
The configuration guide has a very good procedure for configuring SRM, converting from DRM to SRM, and performing
software upgrades with SRM enabled. The latest recommended procedures are available at the following URLs:
"Configuring Single Router Mode Redundancy"
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_7_3/confg_gd/redund.htm#1071789
"Upgrading Images with Single Router Mode Enabled"
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_7_3/confg_gd/redund.htm#1071832
2. This feature does not apply to the supervisor1a/PFC/MFSCx because the PFC uses flow-based forwarding architecture and all new flows are initially sent to
the MSFCx software path.
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