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Layer 3 Switching Software Feature and Configuration Guide
78-6235-04, Cisco IOS Release 12.0(10)W5(18)
Chapter 4 Configuring Interfaces
Configuring the POS OC-12c Uplink Interface (Catalyst 8540)
Default Configuration
Table 4-1 shows the default configuration of an enabled POS OC-12c uplink interface. To change any
of these values, see the instructions in the following sections, “Initially Configuring the POS Interface”
and “Customizing the Configuration.”
Initially Configuring the POS Interface
You should configure the following properties for a newly installed POS OC-12c uplink interface:
• IP routing
• IP address
• Encapsulation type
• Clock source
You should also configure the following properties to match those of the interface at the other end:
• Keepalive messages
• Cisco Discovery Protocol (CDP)
• Cyclic redundancy check (CRC)
• Scrambling
• Encapsulation type
Table 4-1 POS OC-12c Uplink Interface Default Configuration Values
Parameter Configuration Command Default Value
Keepalive [no] keepalive seconds Keepalives enabled, 10 seconds
Encapsulation encapsulation {hdlc | ppp} HDLC
Cisco Discovery Protocol (CDP) [no] cdp enable CDP enabled
Maximum transmission unit
(MTU)
[no] mtu bytes 4470 bytes
Framing pos framing {sdh | sonet} SONET OC-12c
Bandwidth [no] bandwidth kbps 622000 kbps (not configurable)
SONET overhead pos flag {c2 value | j0 value |
s1s0 value}
c2 (path signal byte) set to 0xcf;
j0 (section trace byte) set to
0xcc;
s1s0 (bit s1 and s0 of H1) set to 0
Loop internal [no] loopback {internal | line} No loopback
POS SPE scrambling [no] pos scramble-atm POS SPE scrambling enabled
Cyclic redundancy check crc {16 | 32}32
Clock source clock source {internal | line} Line