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NX-OS show ip arp Adjacencies learnt on non-active FHRP router

mike kao
Level 1
Level 1

‎12-01-2016 12:39 AM - edited ‎03-08-2019 08:23 AM

Hi,

I have two Nexus 7010 are running vPC and HSRP.

Show ip arp on standby Nexus 7010 display some * (star sign).

Can someone tell me that "* - Adjacencies learnt on non-active FHRP router" mean?

The command output:

N7KA2# sh ip arp

Flags: * - Adjacencies learnt on non-active FHRP router
       + - Adjacencies synced via CFSoE
       # - Adjacencies Throttled for Glean
       D - Static Adjacencies attached to down interface

IP ARP Table for context default
Total number of entries: 993
Address         Age       MAC Address     Interface
10.10.177.6     00:08:32  000c.290e.a243  Vlan177          *
10.10.177.10    00:00:18  INCOMPLETE      Vlan177         
10.10.177.11    00:00:23  INCOMPLETE      Vlan177         
10.10.177.18    00:00:28  INCOMPLETE      Vlan177         
10.10.177.31    00:14:26  0050.56bb.a55a  Vlan177         
10.10.177.32    00:07:03  0060.164a.a345  Vlan177         
10.10.177.33    00:12:54  0060.164a.a1ef  Vlan177         
10.10.177.36    00:07:19  0050.56bb.a6a2  Vlan177          *
10.10.177.37    00:14:54  0050.56bb.a0ef  Vlan177         
10.10.177.38    00:11:39  0050.56bb.a697  Vlan177          *
10.10.177.39    00:03:10  000c.2998.a361  Vlan177         
10.10.177.40    00:02:09  000c.29ab.afd5  Vlan177          *
10.10.177.41    00:04:23  000c.2966.a946  Vlan177         
10.10.177.42    00:02:17  000c.295a.a92e  Vlan177         
10.10.177.43    00:11:56  000c.2927.a79d  Vlan177          *
10.10.177.44    00:15:13  000c.290e.a5d2  Vlan177         
..............................
N7KA2#
N7KA2#
N7KA2#
N7KA2# sh ip arp fhrp-non-active-learn

Flags: D - Static Adjacencies attached to down interface

IP ARP Table for context default
Address         Age       MAC Address     Interface
10.10.177.6     00:08:42  000c.290e.a243  Vlan177         
10.10.177.36    00:07:29  0050.56bb.a6a2  Vlan177         
10.10.177.38    00:11:49  0050.56bb.a697  Vlan177         
10.10.177.40    00:02:19  000c.29ab.afd5  Vlan177         
10.10.177.43    00:12:06  000c.2927.a79d  Vlan177         
10.10.177.73    00:11:33  0025.b502.a06e  Vlan177         
10.10.177.74    00:11:22  0025.b502.a00f  Vlan177         
10.11.12.18     00:18:02  74d0.2b9a.a919  Vlan112         
10.11.12.20     00:08:26  000c.295a.aa4b  Vlan112         
10.11.12.28     00:11:55  0021.f717.a040  Vlan112         
10.11.12.31     00:00:58  9c8e.9988.a963  Vlan112         
10.11.12.36     00:16:20  4487.fc9a.a31f  Vlan112         
10.11.12.38     00:00:10  4487.fcd9.a03d  Vlan112         
10.11.12.41     00:01:39  7427.eafe.abbe  Vlan112         
10.11.12.47     00:07:32  74d0.2b9b.a1c6  Vlan112         
10.11.12.54     00:00:35  40a8.f049.ad47  Vlan112         
...........................................

N7KA2# sh hsrp br
                     P indicates configured to preempt.
                     |
Interface   Grp Prio P State    Active addr      Standby addr     Group addr
Vlan2       2   100  P Standby  10.10.2.250      local            10.10.2.254     (conf)
Vlan3       3   100  P Standby  10.10.3.250      local            10.10.3.254     (conf)
Vlan9       9   100  P Standby  10.10.9.250      local            10.10.9.254     (conf)
Vlan10      21  100  P Standby  10.2.1.250       local            10.2.1.253      (conf)
Vlan11      11  100  P Standby  10.10.11.250     local            10.10.11.254    (conf)
Vlan23      23  100  P Standby  10.10.23.250     local            10.10.23.254    (conf)
Vlan27      27  100  P Standby  10.10.27.250     local            10.10.27.254    (conf)
Vlan35      35  100  P Standby  10.10.35.250     local            10.10.35.254    (conf)
Vlan54      54  100  P Standby  10.10.54.250     local            10.10.54.254    (conf)
Vlan55      55  100  P Standby  10.10.55.250     local            10.10.55.254    (conf)
Vlan56      56  100  P Standby  10.10.56.250     local            10.10.56.254    (conf)
Vlan80      80  100  P Standby  10.10.80.250     local            10.10.80.254    (conf)
Vlan101     101 100  P Standby  10.10.1.250      local            10.10.1.254     (conf)
Vlan112     112 100  P Standby  10.11.12.250     local            10.11.12.254    (conf)
Vlan123     123 100  P Standby  10.10.123.250    local            10.10.123.254   (conf)
Vlan177     177 100  P Standby  10.10.177.250    local            10.10.177.254   (conf)

3 people had this problem
Labels:
0 Helpful
5 Replies 5

David Morganelli
Level 1
Level 1

‎12-21-2016 07:32 AM

I see the same thing on a pair Nexus 9332PQ's acting distribution switches (L3)

I don't recall ever seeing this

sho ip arp vlan 3566 vrf Corp-DMZ

Flags: * - Adjacencies learnt on non-active FHRP router
       + - Adjacencies synced via CFSoE
       # - Adjacencies Throttled for Glean
       D - Static Adjacencies attached to down interface

IP ARP Table
Total number of entries: 12
Address         Age       MAC Address     Interface
10.33.66.1      00:17:44  0000.0c9f.f042  Vlan3566        
10.33.66.2      00:17:44  881d.fcc9.bb19  Vlan3566        
10.33.66.9      00:17:00  0050.5686.6741  Vlan3566         *
10.33.66.13     00:12:48  0050.5686.5638  Vlan3566         *
10.33.66.14     00:12:45  0050.5686.39d3  Vlan3566         *
10.33.66.15     00:06:47  0050.5686.767f  Vlan3566         *
10.33.66.16     00:05:27  0050.5686.084a  Vlan3566        
10.33.66.25     00:12:45  d4ae.5287.fd0b  Vlan3566         *
10.33.66.26     00:17:46  0025.90e6.2bc2  Vlan3566        
10.33.66.32     00:16:15  0050.5686.63a9  Vlan3566        
10.33.66.36     00:18:42  44a8.421a.d770  Vlan3566        
10.33.66.60     00:17:44  0010.e08d.b5e4  Vlan3566       

0 Helpful

paolo.retamal
Level 1
Level 1

‎11-15-2017 05:04 AM

Can someone tell me that "* - Adjacencies learnt on non-active FHRP router" mean?
0 Helpful

satish.txt1
Level 1
Level 1
In response to paolo.retamal

‎07-03-2018 08:24 PM

I am seeing same issue,  *   which i don't understand where its coming from.. also i have notice my host only pinging even IPs but not odd like 1.1.1.1, 1.1.1.3, 1.1.1.5  are not pinging but 1.1.1.2, 1.1.1.4, 1.1.1.6 are pinging.. 

 

I am seeing * on one of vPC switch and if i do clear ip arp x.x.x.x  after that my host start pinging everything, all issue got resolved.. 

 

Total number of entries: 1
Address         Age       MAC Address     Interface
74.xx.xx.166  00:17:53  3863.bb41.abc8  Vlan100          *

 

0 Helpful

Brian Dean
Level 1
Level 1
In response to satish.txt1

‎09-05-2019 10:12 AM

Did you ever run into this again or find any additional solutions? I'm having a similar problem as well. 

0 Helpful

smurp0513
Level 1
Level 1
In response to Brian Dean

‎04-07-2020 08:26 AM

I'm troubleshooting an individual IP that is unreachable in a subnet in which all others applied to this particular server are. 

 

Haven't found anything statically assigned, or blocked for that IP, but that MAC address does report this *

0 Helpful
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