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Cisco 6503 - Catalyst Firewall Security Sys Beyaz Kitap

Example 2: Classic and Fabric-Enabled System

The following output is from a conﬁguration with dual supervisor engines, one SFM, one classic line card in slot 3, and two

fabric-enabled line cards in slots 7 and 9.

Sup-A> (enable) show fabric channel switchmode

Module Num Fab Chan Fab Chan Switch Mode

------ ------------ -------- ------------ --------------

1 0, 0 flow through ok

1 0, 1 truncated

0 n/a

n/a

18 0, 0 n/a

18 1, 1 n/a

18 2, 2 n/a

18 3, 3 n/a

18 4, 4 n/a

18 5, 5 n/a

18 6, 6 n/a

18 7, 7 n/a

18 8, 8 n/a

18 9, 9 n/a

18 10, 10 n/a

18 11, 11 n/a

18 12, 12 n/a

18 13, 13 n/a

18 14, 14 n/a

18 15, 15 n/a

18 16, 16 n/a

18 17, 17 n/a

1 0, 6 truncated

1 0, 8 truncated

0 n/a

n/a

0 n/a

n/a

Automatic switching mode changes allow the acceptance of classic or fabric-enabled cards into a system with no manual

conﬁguration change. As previously stated, there is a performance versus interoperability tradeoff when installing classic line

cards into a fabric-enabled system. Because many network environments hold performance in higher regard, a fabric-enabled

system can be conﬁgured to reject classic cards (for example, not support ﬂow-through mode). By issuing the set system

crossbar-fallback none command, the system will not start classic line cards installed in the chassis, thereby running in

compact switching mode (30 Mpps) only.

Sup-A> (enable) set system crossbar-fallback none

The default for the crossbar-fallback is bus mode. To determine the current system state, the show system crossbar-fallback

command is available.

Sup-A> (enable) show system crossbar-fallback

Cross-fallback: bus-mode

In summary, the SFM can be redundantly conﬁgured in a chassis to provide fabric-to-fabric and fabric-to-bus failover. A

system conﬁgured with dual SFMs can use the standby SFM for failover. Additionally, single SFM systems with

fabric-enabled line cards can fail over to the 32-Gbps bus for continuous operation. In both of these scenarios, recovery and

return to normal operation occur in less than three seconds. This quick recovery time allows for a switching mode change and

a synchronization process that must take place between each line card, supervisor engine, and the SFM fabric channels in these

scenarios. The capability to conﬁgure redundant SFMs provides up to three levels of backplane redundancy, helping to enable

continuous operations with minimal impact to network availability in the event of a hardware failure.

Channel Status

n/a

unknown

n/a

Cisco Systems, Inc.

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