Access, Network, and Hybrid Ports

All ports must be set to access (customer-facing), network, or hybrid mode. When the mode is configured on a port, the appropriate encapsulation type must be configured to distinguish the services on the port or channel (for access mode), or to define the transport mode (for network mode).

For the 16-port T1/E1 ASAP Adapter card, 32-port T1/E1 ASAP Adapter card, and 4-port DS3/E3 Adapter card, the card must be enabled to support a set of software services before the encapsulation type is configured. This support is enabled using the mda-mode command (see the mda-mode command in the Configuration Command Reference section):

• access ports — configured for customer-facing traffic on which services are configured. If a Service Access Point (SAP) is to be configured on the port or channel, the port or channel must be configured as an access port or channel.

  The encapsulation type on the 16-port T1/E1 ASAP Adapter card and the 32-port T1/E1 ASAP Adapter card can be ipcp, cem, atm, frame-relay, hdlc, or cisco-hdlc.

  On the 12-port Serial Data Interface card, the encapsulation type can be cem, ipcp, frame-relay, hdlc, or cisco-hdlc, depending on the interface type. V.35 ports and X.21 ports at super-rate speeds (64 kb/s and above) support all of the above encapsulation types. RS-232 ports and X.21 ports operating at subrate speeds support only cem encapsulation. RS-530 ports support only cem encapsulation.

  On the 4-port T1/E1 and RS-232 Combination module, the encapsulation type for T1/E1 ports can be ipcp or cem. RS-232 ports operating at subrate speeds support only cem encapsulation.

  On the 6-port E&M Adapter card, 8-port Voice & Teleprotection card, 8-port C37.94 Teleprotection card, 8-port FXO Adapter card, and 6-port FXS Adapter card, the encapsulation type must be cem.

  On the 8-port Gigabit Ethernet Adapter card, 6-port Ethernet 10Gbps Adapter card, 10-port 1GigE/1-port 10GigE X-Adapter card, Packet Microwave Adapter card, 4-port SAR-H Fast Ethernet module, 6-port SAR-M Ethernet module, and the Ethernet ports on all fixed platforms with Ethernet ports, the encapsulation type can be set as null, dot1q, or qinq.

  Note:

  • The 10-port 1GigE/1-port 10GigE X-Adapter card supports qinq only when it is in 10-port 1GigE mode.

  • The Packet Microwave Adapter card supports qinq only when the port is not in mw-link mode.

  On the 4-port OC3/STM1 Clear Channel Adapter card, the encapsulation type must be atm.

  On the 4-port DS3/E3 Adapter card, the encapsulation type for DS3/E3 clear channel ports can be atm, cem, or frame-relay. The encapsulation type for DS3 channelized ports can be cem or frame-relay.

  On the 2-port OC3/STM1 Channelized Adapter card, the encapsulation type can be ipcp, cem, or atm.

  On the 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card, the encapsulation type must be cem.

• network ports — configured for network-facing traffic. Network ports are used as uplinks for Ethernet, ATM, PPP, and TDM pseudowires.

  On the Ethernet cards, the Packet Microwave Adapter card, the 2-port 10GigE (Ethernet) Adapter card, and 2-port 10GigE (Ethernet) module, the encapsulation type can be set as null or dot1q.

  Note: QinQ encapsulation is not supported on a port in network mode.

  The encapsulation type must be ppp-auto for PPP/MLPPP bundles on the following:

  • T1/E1 ports on the 7705 SAR-A

  • T1/E1 ports on the 7705 SAR-M

  • T1/E1 ports on the 7705 SAR-X

  • 16-port T1/E1 ASAP Adapter card

  • 32-port T1/E1 ASAP Adapter card

  • 2-port OC3/STM1 Channelized Adapter card

  • 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card

  • T1/E1 ports on the 4-port T1/E1 and RS-232 Combination module (on 7705 SAR-H)

  Network PPP (encapsulation type ppp-auto) can be configured to use some with fractional ppp or all the timeslots on T1/E1 ports on the following cards:

  • T1/E1 ports on the 7705 SAR-A

  • T1/E1 ports on the 7705 SAR-M

  • T1/E1 ports on the 7705 SAR-X

  • 16-port T1/E1 ASAP Adapter card

  • 32-port T1/E1 ASAP Adapter card

  • T1/E1 ports on the 4-port T1/E1 and RS-232 Combination module (on 7705 SAR-H)

  On the 4-port OC3/STM1 Clear Channel Adapter card, 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card, 4-port DS3/E3 Adapter card, and 2-port OC3/STM1 Channelized Adapter card, the encapsulation type must be ppp-auto. Fractional PPP is not supported on these cards; all timeslots of the DS1 channel will be used.

• hybrid ports — configured for access (customer-facing) and network-facing traffic. Hybrid ports can support access and network modes simultaneously over different VLANs. Within the span of a port, some of the VLANs can be in access mode and associated with SAPs for various services, while other VLANs can be in network mode and support any of the network-side operations, including label switching, IP forwarding (GRT IP routing), GRE SDPs, and so on.

The default modes are listed in Table: Default Port Mode per Adapter Card, Module, or Platform. All channel groups on a port must either be all access or all network channel groups; there cannot be a mix. When the first channel group is configured, all other channel groups on that port must be set to the same mode. To change modes, all channel groups must first be shut down.