Customizing the Configuration | Cisco Systems 8510 CSR, 8540 CSR

Chapter 4 Configuring Interfaces

Configuring the POS OC-12c Uplink Interface (Catalyst 8540)

Additional Configurations

To configure additional properties to match those of the interface at the far end, perform the following steps, beginning in global configuration mode:

			Command	Purpose
Step 1
Step 1			Router(config-if)# no keepalive	Turns off keepalive messages. Keepalive messages, though not
				required, are recommended.
Step 2
Step 2			Router(config-if)# no cdp enable	Turns off CDP, which is not required.
Step 3
Step 3			Router(config-if)# crc {16 32}	Sets the CRC value. If the device to which the POS module is
				connected does not support the default CRC value of 32, set both
				devices to use a value of 16.


Note			The above steps apply both to the POS OC-12c uplink interface on the switch router and
			to the interface to which it connects at the far end.

Customizing the Configuration

This section describe how to customize the configuration of the POS OC-12c uplink interface to match your network environment.

Setting the MTU Size

To set the maximum transmission unit (MTU), perform the following steps, beginning in global configuration mode:

			Command	Purpose
Step 1
Step 1			Router(config)# interface pos	Enters interface configuration mode and specifies the POS
			slot/subslot/interface	interface to configure.
			Router(config-if)#
Step 2
Step 2			Router(config-if)# mtu bytes	Configures the MTU size up to a maximum of 9188 bytes. Default
				MTU size is 4470 bytes.


Note			The POS OC-12c uplink interface supports IP unicast and IP multicast fragmentation. For
			IP unicast fragmentation, the packet must ingress on a POS interface and egress on any
			interface. For IP multicast fragmentation, IP multicast data packets greater than
			1500 bytes are fragmented to 1500 bytes on the ingress POS interface before being
			switched to other members in the multicast group. All the members in the multicast group
			must have a MTU equal to or greater than 1500 bytes.

		Layer 3 Switching Software Feature and Configuration Guide
		Layer 3 Switching Software Feature and Configuration Guide
	78-6235-04, Cisco IOS Release 12.0(10)W5(18)			4-17
	78-6235-04, Cisco IOS Release 12.0(10)W5(18)			4-17

Image 17

Cisco Systems 8510 CSR, 8540 CSR appendix Customizing the Configuration, Additional Configurations, Setting the MTU Size

Contents

Configuring Interfaces Interface Port Identifier Overview of Interface ConfigurationMedia Access Control Address Routerconfig# interface gigabitethernet 1/0/1 General Instructions for Configuring InterfacesRouter# configure terminal About Layer 3 Switching Interfaces Command Purpose Initially Configuring Gigabit Ethernet InterfacesAbout the Enhanced Gigabit Ethernet Interfaces Catalyst Example Command Description Initially Configuring Fast Ethernet InterfacesVerifying the Ethernet Interface Configuration Router# show interface fastethernet 1/0/0 ExamplesRouter# show interface gigabitethernet 0/0/0 About Virtual LANs Configuring ISL Vlan Encapsulation Routerconfig-subif# Enters subinterface configuration modeConfigure the Fast Ethernet main interface Routerconfig-if# Routerconfig# bridge bridge-group protocol ieee Routerconfig# interface fastethernet 1/0/1.1 Configuring 802.1Q Vlan EncapsulationRouterconfig-subif#interface fastethernet 1/0/0 Routerconfig-subif#interface fastethernet 3/0/1 Ieee Bridge-group About Packet over Sonet Catalyst Monitoring Vlan Operation POS About the POS OC-12c Uplink Interface Configuring the POS OC-12c Uplink Interface Catalyst Parameter Configuration Command Default Value Default ConfigurationInitially Configuring the POS Interface Ip-address subnet-mask Automatic Reverting of Clock SourceHdlc ppp Line internal Setting the MTU Size Customizing the ConfigurationAdditional Configurations Configuring Sonet Overhead Configuring FramingSdh sonet Value j0 value sls0 value Scramble-atm Configuring POS SPE ScramblingScrambling is on by default Configuring Sonet Alarms Alarm Description Configuring Sonet Delay TriggersAlarm Lais pais plop prdi slof Verifying the POS ConfigurationSlos Triggers line path millisecond Router# show protocols pos 1/0/0 LOP = PLM-P Router# show controllers pos 2/0/0 Router# show controller pos 2/0/0 detail Smdr About the ATM Uplink Interface About ATM Uplinks Catalyst Configuration Overview Configuring the ATM Uplink Interface CatalystNo loopback No atm sonet stm-1 for OC-3 No atm clock internal Initially Configuring the ATM Uplink InterfaceAtm vc-per-vp Parameter Value Configuring the Clock Source Routerconfig-if# atm sonet Configuring Sonet FramingStm-1 ATM interface or to STM-4 for the OC-12c interface Msg line j1 16byte exp-msg Overhead c2 byte j0 bytesSls0 is part of the payload pointer byte Line msg line 64byte exp-msg Configuring Loopback Configuring CDP Configuring Virtual CircuitsConfiguring the Maximum VCs per VP Creating a PVC Vpi vci aal-encap Mapping a Protocol Address to a PVCIp-address atm-vc vcd Name Switch Router B Verifying the ATM ConfigurationSwitch Router a 5CB About Port Snooping Configuring Interfaces About Port Snooping Restrictions on Port Snooping Configuring SnoopingAbout the Snooping Destination Port About the Snooping Source Port Source-port Direction receive transmit both Show snoop interface Monitoring SnoopingDestination-port Show snoop 78-6235-04, Cisco IOS Release 12.010W518