Administrator Guide

Sample Scenario for VLT Proxy Gateway
Figure 149. VLT Proxy Gateway — Topology 2
1. The above figure (Topology 2) shows a sample VLT Proxy gateway scenario. There 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 undergoes 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].
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VLT Proxy Gateway