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Line Interfaces
Flow Control and Bandwidth Considerations
By design, the SCE platform reacts to Ethernet flow control and does not activate it. Therefore, it is
Note
possible for a situation to arise in which flow control actually stalls the SCE platform by overflowing
the SCE platform queues, thereby causing traffic to be dropped on the Rx interfaces. If this situation
persists for more than five seconds, it may trigger the internal sanity checks mechanism within the SCE
platform, which may in turn trigger a reload of the SCE platform in an attempt to recover
Note
Using the SCE platform shapers ('Setting the Total Interface BW') with low values (on the order of tens
or a few hundred Mbps) may result in system congestion and potential service loss. This is a known
system limitation.
Configuring the Gigabit Ethernet Line Interfaces
The maximum packet size supported by the SCE 2000 and SCE 1000 platforms is 1600 bytes
Note
How to Configure a Specific Gigabit Ethernet Line Interface
Step 1
At the SCE# prompt, type configure
Enters Global Configuration mode.
Step 2
At the SCE(config)# prompt, type interface GigabitEthernet 0/portnumber, and press Enter, where
portnumber is the number of the selected port (1-4).
Enters Interface Configuration mode for the selected GBE interface.
Step 3
At the SCE(config if)# prompt, type auto-negotiate
Enables auto-negotiation.
At the SCE(config if)# prompt, type exit and press Enter.
Step 4
Exits to global configuration mode, from which you can access a different Gigabit Ethernet interface.
Repeat steps 2 and 3 for the remaining Gigabit Ethernet interfaces.
Step 5
Auto-negotiation must enabled separately and explicitly for each Gigabit Ethernet interface.
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
6-2
and press Enter.
,
and press Enter,
,
Chapter 6
Configuring the Line Interface
OL-7827-12
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