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Question What are the differences in packet processing between a VT interface and an LSI interface (vrf-table-label or no-tunnel-services)? Answer The LSI interface provides better packet processing performance than the VT interface, unless there are core-facing interface restrictions or loss of ingress forwarding functionality, because the frame is sent only once through the route lookup. In a VT interface, the packet loops back, with a first pass as mpls-vrf and a second pass for frame processing. The VT interface is limited by an overall tunnel bandwidth of 1/10 Gbps
We recommend the following optimization on the SNMP managers: Use the row-by-row polling method, not the column-by-column method Reduce the number of variable bindings per PDU Increase timeout values in polling and discovery intervals Reduce the incoming packet rate at the SNMP process (snmpd) For better SNMP response on the device, Junos OS does the following: Filters out duplicate SNMP requests Excludes interfaces that are slow in response from SNMP queries One way to determine a rate limit is to note an increase in the Currently Active count from the show snmp statistics extensive command
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