Cisco 6500 - Catalyst Series 10 Gigabit EN Interface Module Expansion User Manual - Page 3

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OSPF

Switch(config)# router ospf 100

Switch(config−router)# nsf

Switch# show ip ospf

Routing Process "ospf 100" with ID 10.120.250.4

Start time: 00:01:37:484, Time elapsed: 3w2d

!−−− part of the output truncated

Supports Link−local Signalling (LLS)

!−−− indicates that OSPF is configured to be NSF aware

!−−− part of the output truncated

Non−Stop Forwarding enabled, last NSF restart 3w2d ago (took 31 secs)

!−−− indicates that OSPF is configured to be NSF capable

!−−− rest of the output truncated

Refer to Configuring NSF with SSO Supervisor Engine Redundancy for more information on NSF.

OOB MAC Synchronization

In distributed switching, each Distributed Feature Card (DFC) maintains its own CAM table. This means that

each DFC learns the MAC address and ages them, which depends on the CAM aging and traffic matching of

that particular entry. With distributed switching, it is normal that the supervisor engine does not see any traffic

for a particular MAC address for a while, so the entry can expire. There are currently two mechanisms

available to keep the CAM tables consistent between the different engines, such as DFC, which is present in

line modules, and Policy Feature Card (PFC), which is present in supervisor modules:

•

Flood to Fabric (FF)

•

MAC Notification (MN)

When a MAC address entry is aged out on the PFC, the show mac−address address <MAC_Address> all

command displays the DFC or PFC that holds this MAC address. In order to prevent the age out of an entry

on a DFC or PFC, even if there is not traffic for that MAC address, enable the MAC address synchronization.

Issue the mac−address−table synchronize global configuration command and clear mac−address−table

dynamic privileged EXEC command in order to enable the synchronization. This mac−address−table

synchronize command is available from Cisco IOS Software Releases 12.2(18)SXE4 and later. After you

enable it, it is possible to still see entries that are not present in PFC or DFC. However, the module has a way

to learn it from others that use Ethernet Out of Band Channel (EOBC).

Recommendations

Enable Out−of−Band MAC synchronization. It is used in order to synchronize mac−address tables across the

forwarding engines. If WS−6708−10G is present in the VSS system, MAC synchronization is automatically

enabled. If not, it must be enabled manually.

Dist−VSS(config)# mac−address−table synchronize

% Current activity time is [160] seconds