Restrictions Of Dcc - Cisco ASR 900 Series Configuration Manual

Restrictions of DCC

As shown in the figure above, the logical interface for DCC channels is called a SONET Data Communications
Channel (SDCC). Each SDCC interface is assigned an IP address. The Routing Information Protocol (RIP)
is used as the routing protocol for the IP DCC network.
For OSI network, CLNS or ISIS protocol is used for routing and node discovery. The data layer encapsulation
is LAPD.
Figure 12: DCC for OSI Network
For IP netwok, IP or OSPF protocol is used for routing and node discovery. The data layer encapsulation is
PPP.
Figure 13: DCC for IP Network
Static IP configuration and PPP authentication are also supported. DCC also works with APS 1+1 and UPSR
protection infrastructure.
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Restrictions of DCC
• Only routing IP and OSI domains are supported; layers 4 to 7 of OSI model is not supported.
• Interworking of OSPI and IP domains is not supported.
• CLNS MTU supported is 1489 on routers.
• CLNS interop with ONS is not supported.
• ISIS packet bigger than LAPD MTU is not dropped.
• The feature is not supported on 1+1 APS.
• 1+1 APS with CLNS mode is not supported.
1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x
(Cisco ASR 900 Series)
156
Restrictions of DCC, page 156
Configuring PPP, page 157
Configuring CLNS or LAPD, page 157
Verification of DCC Configiration, page 157
Configuring Data Communication Channel