Allied Telesis C613-16164-00 REV E Sharing VRF routing and double tagging on the same port, Green

VCStack and VRF-lite

Sharing VRF routing and double tagging on the same port

In this scenario, both VRF-lite traffic and double vlan tagged traffic is transported between the two x610 switches via a single shared port. The double tagging feature (nested vlans) makes use of the tag-in-tag technique. The inner tag comes from the end hosts whilst the outer tag is configured in the x610 switches. VRF-lite traffic remains separated from the double vlan tagged traffic.

																			port6										.2
																												.111
																										.	168			.2
																			192.
																										192				.112
																	port5		vrf		168vlan112.							.	168			.1
																						112.
																												192			.78
																				green		1
																	192.													.	168
																	vrf	168vlan111.												192
																		red	111.
																				1
										port20									x610 A
										vlan20	provider
										vlan11			port
										vlan12	192.
											168.
											192.		11.											port12
											168. 2			vrf										vlan20
							port5						12.		red				port20							customer
													2	vrf
							192.
																			vlan20
							vrf		168vlan211.						green
																			vlan11			provider						port
									red	211.		x610
										1									vlan12				port
																						192.
																						168.
															B							192.	11.
																							1
																						168.		vrf
																							12.		red
																							1	vrf
																									green
															port12
			.2
															vlan20
	.	211										port6				customer
.	168				.	2
192
				.	212							192.					port
		.	168					.2				vrf 168vlan212.
	192					.	78								212.
					.168								green		1
				192

Communication plan

Host 192.168.111.2 A can communicate with host 192.168.211.2 by VRF red routing.

Host 192.168.112.2 A can communicate with host 192.168.212.2 by VRF green routing.

Host 192.168.78.1 can communicate with host 192.168.78.2 by double tagging. When Ethernet frames enter the customer edge port, the switch adds an outer vlan tag (VID 20) on top of the customer inner vlan tag. Ethernet frames can also be sent untagged from the hosts. The customer VID (inner tag) is ignored whilst the frames are bridged between the two x610 switches. As Ethernet frames exit the customer edge port of the destination switch, the outer tag is removed. Therefore, when the packets exit the customer port, the original VLAN tags (or untagged Ethernet frames) are preserved.

Configure VRF-lite Page 75