Cisco Router Cisco IOS XR - Page 51

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Cisco IOS XR Getting Started Guide
OL-10957-02
Chapter 3 Bringing Up the Cisco IOS XR Software on a Multishelf System
Configuring the External Cisco Catalyst 6509 Switches
Step 10
spanning-tree mst forward-time seconds
Example:
router(config)# spanning-tree mst forward-time 6
Sets the forward-delay timer for all MST instances on
the switch.
• We recommend 6 seconds.
Step 11
spanning-tree mst max-age seconds
Example:
router(config)# spanning-tree mst max-age 8
Sets the maximum-age timer for all MST instances on
the switch.
• We recommend 8 seconds.
Step 12
spanning-tree mst max-hops hops
Example:
router(config)# spanning-tree mst max-hops 4
Specifies the number of possible hops in the region
before a BPDU is discarded.
• We recommend 4 hops.
Step 13
spanning-tree mst instance_id priority priority
Example:
router(config)# spanning-tree mst 0-1 priority
28672
Sets the spanning tree priority for the switch.
• The primary Catalyst switch should be configured
with priority 0. Priority 0 makes the switch the root
of the network.
• The second Catalyst switch should be configured
with a number greater than 0 and less than 32768. If
the primary Catalyst switch (priority 0) fails, the
second switch becomes the root of the network.
Step 14
udld aggressive
Example:
router(config)# udld aggressive
Enables the Unidirectional Link Detection (UDLD)
protocol aggressive mode.
Step 15
udld message time interval
Example:
router(config)# udld message time 7
Configures the time between UDLD probe messages on
ports that are in advertisement mode and are currently
determined to be bidirectional.
• Valid values are from 7 to 90 seconds.
• We recommend 7 seconds.
Step 16
interface gigabitethernet slot/port
Example:
router(config)# interface GigabitEthernet3/1
Enters interface configuration mode for the specified
interface.
Step 17
switchport
Example:
router(config-if)# switchport
Configures a LAN interface as a Layer 2 interface in
preparation for additional switchport commands.
Step 18
switchport mode access
Example:
router(config-if)# switchport mode access
Specifies a nontrunking, nontagged single-VLAN
Layer-2 interface.
Command or Action Purpose