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Cisco 6503 - Catalyst Firewall Security Sys Beyaz Kitap

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.

Cisco Systems, Inc.

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