Users Guide

8 If the port-channel specified in theproxy-gateway command is not a VLT LAG, the configuration is rejected by the CLI. The VLT
LAG cannot be configured as a legacy LAG when it is part of a proxy-gateway
9 You cannot change the LLDP port channel interface to a legacy LAG when you enable the proxy gateway.
10 Dell recommends using thevlt-peer-mac transmit command only for square VLTs without diagonal links.
11 VRRP and IPv6 routing is not supported.
12 Private VLANs (PVLANs) are not supported.
13 When a VM moves from one VLT domain to the another VLT domain, the VM host sends the gratuitous GARP. The GARP triggers a
mac movement from the previous VLT domain to the newer VLT domain.
14 After a station move, if a host sends a TTL1 packet destined to its gateway; for example, a previous VLT node, the packet may be
dropped.
15 After a station move, if a host first PINGs its gateway; for example, a previous VLT node it results a 40 to 60% success rate
considering it takes a longer path.
Enabling the VLT Proxy Gateway
To enable the VLT Proxy Gateway feature, the system mac addresses of C and D in the local VLT domain must be installed in C1 and D1 in
the remote VLT domain and vice versa. You can install the mac address in two methods - the proxy-gateway lldp method or the
proxy-gateway static configuration. Proxy-gateway LLDP is a dynamic method of installing the local mac addresses in the remote
VLT domain, which is achieved using a new organizational TLV in LLDP packets.
The VLT proxy gateway can be configured in a VLT domain context using the cli command proxy-gateway LLDP. You enter the
proxy-gateway Configuration mode when you enter this command. The port-channel interface of the square VLT link on which LLDP
packets are to be sent is specified by thepeer-domain-link port-channel command.
Configuring the proxy gateway lldp and the peer-domain-link port channel, LLDP sets TLV flags on the interfaces for
receiving and transmitting private TLV packets. After defining these organizational TLV settings, LLDP encodes the local system mac-
addresses as organizational TLVs for transmitting to the peer. If you specify the no proxy gateway LLDP interface command,
LLDP stops transmitting and receiving proxy gateway TLV packets on the specified interfaces. However, other TLVs are not affected.
From the interfaces on which proxy gateway LLDP is enabled, LLDP decodes TLV packets from the remote LLDP by using the new
organizational TLV.
The following requirements must be satisfied for LLDP proxy gateway to function correctly:
• Because LLDP is a direct link protocol, data centers must be directly connected.
• LLDP has a limited TLV size. As a result, information that is carried by this new TLV is limited to only one or two MAC addresses.
• You must ensure proper configuration and physical setup on all related systems.
LLDP Organizational TLV for Proxy Gateway
Define a new organizational TLV :
• LLDP defines an organizationally specific TLV (type 127) with an organizationally unique identifier (0x0001E8) and organizationally
defined subtype (0x01) for sending or receiving this information.
• LLDP will uses the existing infrastructure and adds the new TLV, and sends and receives only on the configured ports.
• There are only a couple of MAC addresses for each unit to transmit so all currently active MAC addresses are carried on the newly
defined TLV.
• This TLV is recognizable only by Dell Networking devices with this feature support. Other devices ignore this field and are able to
process other standard TLVs.
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VLT Proxy Gateway