On 7210 SAS devices, a port must be configured as one of the following: access, access uplink, network, or hybrid. The following list describes the significance of the different port modes and the support available on different platforms:
access ports
Access ports are 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. When a port has been configured for access mode, one or more services can be configured on the port depending on the encapsulation value.
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 QinQ only. 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.
network ports (applicable only to the 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C)
Network ports are configured for network-facing traffic. These ports participate in the service provider transport or infrastructure network. Dot1q is supported on network ports.
hybrid ports (applicable only to the 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C)
Hybrid ports are configured for access and network-facing traffic. The default mode of an Ethernet port is ‟network”. The mode of a port cannot be changed unless the port is shut down and the configured SAPs and interfaces are deleted. Hybrid ports allow a single port to operate in both access and network modes. The MTU of a port in hybrid mode is the same as in network mode. The default encapsulation for ports in hybrid mode is dot1q; QinQ encapsulation is also supported at the port level.
When the port is changed to hybrid, the default MTU of the port is changed to match the value of 9212 bytes, which is used in network mode (higher than in access mode); this ensures that both SAP and network VLANs can be accommodated.
The only exception is when the port is a 10/100 fast Ethernet port. In this case, 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. All parameters in access and network contexts are configured within the port using the same CLI hierarchy as in the existing implementation. A hybrid port allows both ingress and egress contexts to be configured concurrently.
An Ethernet port configured in hybrid mode can have the following encapsulation type values: dot1q and QinQ. The NULL value is not supported because only a single SAP or network IP interface is allowed, achieved by configuring the port as either access or network, respectively. 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 (MC-LAG) configuration, only access mode can be configured. MC-LAG is not supported on network ports and consequently cannot be supported on hybrid ports.
The following table describes supported port modes on the 7210 SAS platforms.
Port mode platforms |
Access |
Network |
Hybrid |
Access-uplink |
|---|---|---|---|---|
7210 SAS-D |
Yes |
No |
No |
Yes |
7210 SAS-Dxp |
Yes |
No |
No |
Yes1 |
7210 SAS-K 2F1C2T |
Yes |
No |
No |
Yes |
7210 SAS-K 2F6C4T |
Yes |
Yes |
Yes |
Yes |
7210 SAS-K 3SFP+ 8C |
Yes |
Yes |
Yes |
Yes |