Configuring An Lldp Vlt Proxy Gateway - Dell Z9000 Configuration Manual

1. The above figure show a sample VLT Proxy gateway scenario. Their are no diagonal links in the
square VLT connection between the C and D in VLT domain 1 and C1 and D1 in the VLT domain 2.
This undergo sub-optimal routing with the VLT Proxy Gateway LLDP method. For VLT Proxy
Gateway to work in this scenario you must configure the , VLT-peer-mac transmit command
under VLT Domain Proxy Gateway LLDP mode, in both C and D (VLT domain 1) and C1 and D1 (VLT
domain 2). This behavior is applicable only in the LLDP configuration and not required in the static
configuration. Sample Configuration
Dell(conf-vlt-domain)#proxy-gateway lldp
Dell(conf-vlt-domain-pxy-gw-lldp)#vlt-peer-mac transmit
2. ICL shut – Assume ICL between C1 and D1 is shut and if D1 is secondary VLT one half of the inter DC
link goes down. After vm motion, if a packet reaches D2 with the destination MAC address of D1, it
may be dropped. This behaviour is applicable only in the LLDP configuration; in the static
configuration, the packet is forwarded.
3. Any L3 packet, when it gets an L3 hit and is routed because of this feature, has a TTL decrement as
expected.
4. You can disable the VLT Proxy Gateway for a particular VLAN using an "Exclude-VLAN" configuration.
The configuration has to be done in both the VLT domains [C and D in VLT domain 1 and C1 and D1
in VLT domain 2]. Sample Configuration LLDP Method
Dell(conf-vlt-domain)#proxy-gateway ll
Dell(conf-vlt-domain-pxy-gw-lldp)#peer-domain-link port-channel 1 exclude-
vlan 10
Static Configuration Method
Dell(conf-vlt-domain)#proxy-gateway static
Dell(conf-vlt-domain-pxy-gw-static)#remote-mac-address <xx:xx:xx:xx:xx:xx>
exclude-vlan 10
5. Packet duplication may happen with "Exclude-VLAN" configuration – Assume exclude-vlan (say
VLAN 10) is configured in C and D and in C1 and D1; If packets for VLAN 10 with C's MAC address (C
is in VLT domain 1) gets an L3 hit at C1 in VLT domain 2, they are switched to both D1 (via ICL) and C
via inter DC link. This may lead to packet duplication. If C's MAC address is learned at C1, only (no
then) the packet is not have flooded (to D1) and only switched to C and thus packet duplication may
be avoided.
6. With the existing hardware capabilities, you can only disable VLT Proxy Gateway only for 500 VLANs,
using exclude-VLAN configuration.

Configuring an LLDP VLT Proxy Gateway

You can configure a proxy gateway in a VLT domain to locally route packets destined to a L3 endpoint in
another VLT domain.
To configure an LLDP proxy gateway:
1. Enable VLT on a switch, then configure a VLT domain and enter VLT-Domain Configuration mode.
CONFIGURATION mode
Dell(conf)#vlt domain domain-id
2. Configure the LLDP proxy gateway.
VLT DOMAIN mode
Dell(conf-vlt-domain)#proxy-gateway lldp
3. You can configure the port channel interface for an LLDP proxy gateway and exclude a VLAN or a
range of VLANs from proxy routing. This parameter is for an LLDP proxy gateway configuration.
VLT Proxy Gateway
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