Appendix A. Glossary - Lenovo ThinkSystem NE2552E Application Manual

Appendix A. Glossary

DIP
Dport
HBA
NAT
Preemption
Priority
Proto (Protocol)
SIP
SPort
Tracking
VIR
Virtual Router
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The destination IP address of a frame.
The destination port (application socket: for example,
http‐80/https‐443/DNS‐53)
Host Bus Adapter. An adapter or card that interfaces with device drivers in
the host operating system and the storage target in a Storage Area Network
(SAN). It is equivalent to a Network Interface Controller (NIC) from a Local
Area Network (LAN).
Network Address Translation. Any time an IP address is changed from one
source IP or destination IP address to another address, network address
translation can be said to have taken place. In general, half NAT is when the
destination IP or source IP address is changed from one address to another.
Full NAT is when both addresses are changed from one address to another.
No NAT is when neither source nor destination IP addresses are translated.
In VRRP, preemption will cause a Virtual Router that has a lower priority to go
into backup should a peer Virtual Router start advertising with a higher
priority.
In VRRP, the value given to a Virtual Router to determine its ranking with its
peer(s). Minimum value is 1 and maximum value is 254. Default is 100. A
higher number will win out for master designation.
The protocol of a frame. Can be any value represented by a 8‐bit value in the
IP header adherent to the IP specification (for example, TCP, UDP, OSPF,
ICMP, and so on.)
The source IP address of a frame.
The source port (application socket: for example,
HTTP‐80/HTTPS‐443/DNS‐53).
In VRRP, a method to increase the priority of a virtual router and thus master
designation (with preemption enabled). Tracking can be very valuable in an
active/active configuration.
You can track the following:
 Active IP interfaces on the Web switch (increments priority by 2 for each)
 Active ports on the same VLAN (increments priority by 2 for each)
 Number of virtual routers in master mode on the switch
Virtual Interface Router. A VRRP address is an IP interface address shared
between two or more virtual routers.
A shared address between two devices utilizing VRRP, as defined in RFC
2338. One virtual router is associated with an IP interface. This is one of the IP
interfaces that the switch is assigned. All IP interfaces on the NE2552Es must
be in a VLAN. If there is more than one VLAN defined on the Web switch,
then the VRRP broadcasts will only be sent out on the VLAN of which the
associated IP interface is a member.
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