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Aggregated Ethernet Encapsulation for Layer 2 Switching Cross-Connects

You can configure aggregated Ethernet interfaces for CCC connections and for Layer 2 virtual private networks (VPNs).

Aggregated Ethernet interfaces configured with VLAN tagging can be configured with multiple logical interfaces. The only encapsulation available for aggregated Ethernet logical interfaces is vlan-ccc. When you configure the vlan-id statement, you are limited to VLAN IDs 512 through 4094.

Aggregated Ethernet interfaces configured without VLAN tagging can be configured only with the ethernet-ccc encapsulation. All untagged Ethernet packets received are forwarded based on the CCC parameters.

To configure aggregated Ethernet interfaces for CCC connections, include the ae0 statement at the [edit interfaces] hierarchy level:



[edit interfaces]
ae0 {
encapsulation (ethernet-cccextended-vlan-ccc | vlan-ccc);
vlan-tagging;


aggregated-ether-options {
minimum-links links;
link-speed speed;
}




unit logical-unit-number {
encapsulation vlan-ccc;
vlan-id identifier;
family ccc;
}


}

Be aware of the following limitations when configuring CCC connections over aggregated Ethernet interfaces:

If you configured load balancing between child links, be aware that a different hash key is used to distribute packets among the child links. Standard aggregated interfaces have family inet configured. An IP version 4 (IPv4) hash key (based on the Layer 3 information) is used to distribute packets among the child links. A CCC connection over an aggregated Ethernet interface has family ccc configured instead. Instead of an IPv4 hash key, a Multiprotocol Label Switching (MPLS) hash key (based on the destination media access control [MAC] address) is used to distributed packets among the child links.
The extended-vlan-ccc encapsulation is not supported on the 12-port Fast Ethernet PIC and the 48-port Fast Ethernet PIC.
The JUNOS software does not support the Link Aggregation Control Protocol (LACP) when an aggregated interface is configured as a VLAN (with vlan-ccc encapsulation). LACP can be configured only when the aggregated interface is configured with the ethernet-ccc encapsulation.

For more information about how to configure aggregated Ethernet interfaces, see the JUNOS Network Interfaces Configuration Guide.

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