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What are the possible values and definitions for the ARP Flags on S-Series and 7100-Series Router?

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TitleWhat are the possible values and definitions for the ARP Flags on S-Series and 7100-Series Router?
Question
What are the possible values and definitions for the ARP Flags?
Environment
  • 7100-Series
  • S-Series
Answer
VSBSSA180(su-router)->show arp interface vlan.0.4024
 
VSBSSA180(su-router)->show arp interface vlan.0.4024
FLAGS:    U = Unresolved     S = Static
          L = Local          V = VRRP
          * = Stale          B = Best Guess Interface
          H = Host Interest  2 = Secondary VLAN Entry

IP Address      Hardware Address  Flg Age        Updated Interface      Port    
--------------- ----------------- --- ---------- ------- -------------- -------------
10.58.144.25    20-b3-99-7b-28-31   L  52d21h21m       - vlan.0.4024    host.0.1
10.58.144.26    00-e0-63-86-25-7e   H  52d21h21m     51m vlan.0.4024    lag.0.3 
--------------- ----------------- --- ---------- ------- ----------- -------------
ARP Entries Found: 2

U – The router is currently attempting to resolve an ARP entry. An
ARP resolution packet has been sent but a response has not been
received. If a response is not received within three (3) seconds the
Unresolved entry will be removed from the ARP table.
 
L – The IP address and hardware address of this entry is the IP
address and hardware address assigned to a directly connected
interface.
 
V – This is an ARP entry for an interface which is running VRRP.
* – The ARP entry is stale (timed out). The entry will remain in the
database and will be used by the router for “stale-entry-timeout”
seconds. See stale-entry-timeout for more information.
 
S – A permanent (static) entry manually configured.
 
B – Interface was not specified when the static ARP was defined,
router will make a best guess.
 
H – Host Interest: The ARP entry has been used for direct
communication with the router as opposed to communication between
hosts that pass through the router.
 
2 – Secondary VLAN Entry: The ARP entry belongs to a host on a
Secondary VLAN.
Additional notes
Defaulttime out is one hour, after which  an entry is marked stale
      
arp stale-entry-timeout <seconds>

seconds>


Specifies the time in seconds that a stale entry remains in the ARP cache.

Valid values are 1 ‐ 65535 .

Default value: 1200 seconds.

MAC addresses in the SAT do not have any relation to the ARP  table and it is possible for an ARP to time out  even though a host is sending traffic because only ARP packets update the   ARP cache.
 

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