In 7210 SAS devices, port must be configured as either access, access uplink or network. The following paragraphs describe the significance of the different port modes and the support available on different platforms.
access ports
Configured for customer facing traffic on which services are configured. If a Service Access Port (SAP) is to be configured on the port, it must be configured as an access port. When a port is configured for access mode, the appropriate encapsulation type must be configured to distinguish the services on the port. After a port has been configured for access mode, one or more services can be configured on the port depending on the encapsulation value. Access ports can be configured on all the 7210 SAS platforms.
access-uplink ports
Access-uplink ports are used to provide native Ethernet connectivity in service provider transport or infrastructure network. This can be achieved by configuring port mode as access uplink. With this option, the encap-type can be configured to only qinq. Access-uplink SAPs, which are QinQ SAPs, can only be configured on an access uplink port to allow the operator to differentiate multiple services being carried over a single access uplink port. This is the default mode when a node is operating in access-uplink mode.
network ports
Configured for network facing traffic. These ports participate in the service provider transport or infrastructure network. Dot1q is supported on network ports. This is default for nodes operating in network mode.
hybrid ports
Configured for access and network facing traffic. While the default mode of an Ethernet port remains network, the mode of a port cannot be changed between the access/network/hybrid values unless the port is shut down and the configured SAPs or interfaces are deleted. Hybrid ports allow a single port to operate in both access and network modes. MTU of port in hybrid mode is the same as in network mode except for the 10/100 MDA. The default encap for hybrid port mode is dot1q, it also supports QinQ encapsulation on the port level. Null hybrid port mode is not supported.
After the port is changed to hybrid, the default MTU of the port is changed to match the value of 9212 bytes currently used in network mode (higher than an access port); this is to ensure that both SAP and network VLANs can be accommodated.
The only exception is when the port is a 10/100 fast Ethernet. In those cases, the MTU in hybrid mode is set to 1522 bytes, which corresponds to the default access MTU with QinQ, which is larger than the network dot1q MTU or access dot1q MTU for this type of Ethernet port. The configuration of all parameters in access and network contexts will continue to be done within the port using the same CLI hierarchy as in existing implementation. The difference is that a port configured in mode hybrid allows both ingress and egress contexts to be configured concurrently.
An Ethernet port configured in hybrid mode can have two values of encapsulation type: dot1q and QinQ. The NULL value is not supported because a single SAP is allowed, and can be achieved by configuring the port in the access mode, or a single network IP interface is allowed, which can be achieved by configuring the port in network mode. Hybrid mode can be enabled on a LAG port when the port is part of a single chassis LAG configuration. When the port is part of a multi-chassis LAG configuration, it can only be configured to access mode as MC-LAG is not supported on a network port and consequently is not supported on a hybrid port.
The following table describes the port modes that are supported on each 7210 SAS platform.
Port mode platforms |
Access |
Network |
Hybrid |
Access-uplink |
|---|---|---|---|---|
7210 SAS-T |
Yes |
Yes 1 |
Yes 2 |
Yes 3 |
7210 SAS-R6 IMM-b (IMMv2) |
Yes |
Yes |
Yes |
No |
7210 SAS-R6 IMM-c 100GE (IMM-c 1CFP4 or IMM-c 1QSFP28) |
Yes |
Yes |
No |
No |
7210 SAS-R12 IMM-b |
Yes |
Yes |
Yes |
No |
7210 SAS-R12 IMM-c 100GE (IMM-c 1CFP4 or IMM-c 1QSFP28) |
Yes |
Yes |
No |
No |
7210 SAS-Mxp |
Yes |
Yes |
Yes |
No |
7210 SAS-Sx/S 1/10GE |
Yes |
Yes |
Yes |
No |
7210 SAS-Sx 10/100GE |
Yes |
Yes |
Yes |
No |