WAN Interfaces in SRM

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

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.

Cisco Systems, Inc.

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