cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
2695
Views
35
Helpful
16
Replies

VM host issues connected to pair of VPC switches using HSRP

CiscoBrownBelt
Level 6
Level 6

So I have a couple hosts  that continuous pings (testing do to deployment issues) fail mostly from doing pings from servers.

Just have a pair of 3548 Nexus in VPC domain (configured to be active active) and routing for the subnet hosts are in is done via SVI-HSRP. Here are pertaining configs. Any help guys?

 

Same on both switches except:

vpc domain 1                                                                    
  role priority 100 (same for both switches)                                                            
  peer-keepalive destination 172.168.1.1 source 172.168.1.2 vrf vpc-keepalive   
  dual-active exclude interface-vlan 5                                     
  peer-gateway                                                                  
  auto-recovery                                                                 
                                                                                
interface port-channel1                                                        
  vpc peer-link         

-----------

SVI configs

Same on both switches except where noted:

interface Vlan2                                                               
  description ServerHost                                                      
  no shutdown                                                                   
  no ip redirects                                                               
  ip address 172.168.2.2/24                                                   
  hsrp 2                                                                      
    preempt                                                                     
    priority 105 (priority default on Switch 2)                                                                
    ip 172.16.2.1
 
---------------
Same on both switches except
interface Ethernet1/45 and 46                                                           
  description vPC Peer-Link                                                     
  switchport mode trunk                                                         
  channel-group 1 mode active                                                  
  no shutdown   
-------------------------
 
Interfaces for server ports:
 
interface Ethernet1/1 and 2                                                          
  speed 1000                                                                    
  description ServerHost                                                
  switchport mode trunk                                                         
  switchport trunk allowed vlan 2
 switchport trunk native vlan 12                                             
  spanning-tree port type edge trunk                                            
  no shutdown 

------------------------------------------

 

SHOW Commands to help T-shoot:

 

show mac address-table (trouble host mac)

Sw_A# sh mac address-table | inc 03a0.9756.056d                        
* 214      03a0.9756.056d    dynamic   0          F    F  Po1   
 
 
Sw_B# sh mac address-table | inc 03a0.9756.056d                          
* 214      03a0.9756.056d   dynamic   0          F    F  Po1
 
Sw_A# sh port-channel traffic                                        
ChanId      Port Rx-Ucst Tx-Ucst Rx-Mcst Tx-Mcst Rx-Bcst Tx-Bcst                
------ --------- ------- ------- ------- ------- ------- -------                
    1   Eth1/35   0.07%   0.80%   2.25%   3.75%   0.12%   0.52%                
    1   Eth1/36  99.92%  99.19%  97.74%  96.24%  99.87%  99.47%      
 
Sw_B# sh port-channel traffic                                        
ChanId      Port Rx-Ucst Tx-Ucst Rx-Mcst Tx-Mcst Rx-Bcst Tx-Bcst                
------ --------- ------- ------- ------- ------- ------- -------                
    10   Eth1/35  55.87%  19.73%  16.15%  47.77%  98.40%  99.75%                
    10   Eth1/36  44.12%  80.26%  83.84%  52.22%   1.59%   0.24% 
16 Replies 16

Yes, good idea to add it. 

from the document 

Note: For proper behavior, VLAN priorities on both Nexus 7000 switches should be configured the same. 

in your case they are 3000 switches but that does not matter. 

So, in addition to the peer-switch command, you have to make sure that vlan priorities are the same for both switches.

here is a link to the doc

https://www.cisco.com/c/en/us/support/docs/routers/7000-series-routers/116140-config-nexus-peer-00.html#anc6

HTH

 

Yes, good idea to add it. 

Ok will do. Think there is a disruption when adding it as I am not sure and will need a window if so.

 

from the document 

Note: For proper behavior, VLAN priorities on both Nexus 7000 switches should be configured the same. 

in your case they are 3000 switches but that does not matter. 

So, in addition to the peer-switch command, you have to make sure that vlan priorities are the same for both switches.

here is a link to the doc

Ok priorities are the same but as stated I will add the peer-switch command.