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N7k + N5k (not so) loop free architecture

Hi everyone.

I've set up a new Data Center for a customer with the classical Nexus infrastructure as shown in the picture.

Foto1.jpg

N7k-01 and N7k-02 are sharing HSRP on vlan xxx. Also N5k01 and N5k02 have an address on the same xxx vlan for management purpose.

Everything seems to work properly except when I try to ping N5k02 from N7k01 (and vice versa).

The ping result is this:

N7K-1# ping 172.x.y.5

PING 172.x.y.5 (172.x.y.5): 56 data bytes

64 bytes from 172.x.y.5: icmp_seq=0 ttl=254 time=1.116 ms

64 bytes from 172.x.y.5: icmp_seq=0 ttl=253 time=1.803 ms (DUP!)

64 bytes from 172.x.y.5: icmp_seq=1 ttl=254 time=0.711 ms

64 bytes from 172.x.y.5: icmp_seq=1 ttl=253 time=1.176 ms (DUP!)

64 bytes from 172.x.y.5: icmp_seq=2 ttl=254 time=0.748 ms

64 bytes from 172.x.y.5: icmp_seq=2 ttl=253 time=1.227 ms (DUP!)

64 bytes from 172.x.y.5: icmp_seq=3 ttl=254 time=0.646 ms

64 bytes from 172.x.y.5: icmp_seq=3 ttl=253 time=1.182 ms (DUP!)

64 bytes from 172.x.y.5: icmp_seq=4 ttl=254 time=0.631 ms

The issue stops when interface vlan 301 on N7k-2 is shutted down or when interface 1/10 on Nk5-2 is shutted down.

If interface 1/9 on N5k-2 is DOWN and interface 1/10 is UP I still have duplicate response to ping.

I'm going mad with this!!!

Here's the configuration of VPC and interfaces:

N7k1#

feature vpc

vpc domain 1
  role priority 100
  peer-keepalive destination 172.a.b.34 source 172.a.b.33

interface Vlan301
   no shutdown
   description *** VLAN MANAGMENT IN-BAND ***
   ip address 172.x.y.2/26
   ip router ospf 2 area 0.0.0.0
   hsrp version 2
   hsrp 301
     authentication text vlan301
     preempt
     priority 200
     ip 172.x.y.1

interface port-channel1
  description *** Link to N7k-02 ***
  switchport
  switchport mode trunk
  vpc peer-link
  spanning-tree port type network

interface port-channel5
  description Link to N5K
  switchport
  switchport mode trunk
  vpc 5

  spanning-tree port type normal

interface Ethernet10/1
  description Link to N5K-1 e1/9
  switchport
  switchport mode trunk
  udld enable
  channel-group 5 mode active
  no shutdown

interface Ethernet10/2
  description Link to N5K-2 e1/10
  switchport
  switchport mode trunk
  udld enable
  channel-group 5 mode active
  no shutdown

------------------------------------- VPC PEER LINK -------------------------------------

interface Ethernet10/9
  description *** Link to N7K-02 e10/9 ***
  switchport
  switchport mode trunk
  channel-group 1 mode active
  no shutdown

interface Ethernet10/10
  description *** Link to N7K-02 e10/10 ***
  switchport
  switchport mode trunk
  channel-group 1 mode active
  no shutdown

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

N7k-2#

feature vpc

vpc domain 1
   role priority 200
   peer-keepalive destination 172.a.b.33 source 172.a.b.34

interface Vlan301
  no shutdown
  description *** VLAN MANAGMENT IN-BAND ***
  ip address 172.x.y.3/26
  ip router ospf 2 area 0.0.0.0
  hsrp version 2
  hsrp 301
    authentication text vlan301
    preempt
    priority 150
    ip 172.x.y.1

interface port-channel1
   description *** Link to N7k-01 ***
   switchport
   switchport mode trunk
   vpc peer-link
   spanning-tree port type network

interface port-channel5

  description Link to N5K
   switchport
   switchport mode trunk
   vpc 5
   spanning-tree port type normal

interface Ethernet10/2
  description Link to N5K-2 e1/9
  switchport
  switchport mode trunk
  udld enable
  channel-group 5 mode active
  no shutdown

interface Ethernet10/1
  description Link to N5K-1 e1/10
  switchport
  switchport mode trunk
  udld enable
  channel-group 5 mode active
  no shutdown

------------------------------------- VPC PEER LINK -------------------------------------

interface Ethernet10/9
  description *** Link to N7K-01 e10/9 ***
  switchport
  switchport mode trunk
  channel-group 1 mode active
  no shutdown

interface Ethernet10/10
  description *** Link to N7K-01 e10/10 ***
  switchport
  switchport mode trunk
  channel-group 1 mode active
  no shutdown

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

N5k-1

feature vpc

vpc domain 10
  role priority 100
  peer-keepalive destination 172.a.b.36 source 172.a.b.35

interface Vlan301
   no shutdown
   description *** VLAN MANAGEMENT IN BAND ***
   ip address 172.x.y.4/26

interface port-channel1
  description *** Link to N5K-02 Rack-4C ***
  switchport mode trunk
  vpc peer-link

interface port-channel5
  description *** Link to N7K ***
  switchport mode trunk
  vpc 5
  spanning-tree port type normal

interface Ethernet1/9
  description *** Link to N7K-01 e10/1 Rack-3C ***
  switchport mode trunk
  udld enable
  channel-group 5 mode passive

interface Ethernet1/10
  description *** Link to N7K-02 e10/1 Rack-4C ***
  switchport mode trunk
  udld enable
  channel-group 5 mode passive

------------------------------------- VPC PEER LINK -------------------------------------

interface Ethernet1/19
  description *** Link to N5K-02 e1/19 Rack-4C ***
  switchport mode trunk
  udld enable
  channel-group 1 mode active

interface Ethernet1/20
  description *** Link to N5K-02 e1/20 Rack-4C ***
  switchport mode trunk
  udld enable
  channel-group 1 mode active

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

N5k-2

feature vpc

vpc domain 10
  role priority 200
  peer-keepalive destination 172.a.b.35 source 172.a.b.36

interface Vlan301
   no shutdown
   description *** VLAN MANAGEMENT IN BAND ***
   ip address 172.x.y.5/26

interface port-channel1
  description *** Link to N5K-01 Rack-3C ***
  switchport mode trunk
  vpc peer-link

interface port-channel5
  description *** Link to N7K ***
  switchport mode trunk
  vpc 5
  spanning-tree port type normal

interface Ethernet1/9
  description *** Link to N7K-02 e10/2 Rack-4C ***
  switchport mode trunk
  udld enable
  channel-group 5 mode passive

interface Ethernet1/10
  description *** Link to N7K-01 e10/2 Rack-3C ***
  switchport mode trunk
  udld enable
  channel-group 5 mode passive

------------------------------------- VPC PEER LINK -------------------------------------

interface Ethernet1/19
  description *** Link to N5K-01 e1/19 Rack-4C ***
  switchport mode trunk
  udld enable
  channel-group 1 mode active

interface Ethernet1/20
  description *** Link to N5K-01 e1/20 Rack-3C ***
  switchport mode trunk
  udld enable
  channel-group 1 mode active

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

1 ACCEPTED SOLUTION

Accepted Solutions
Franck Zana
Beginner

Try to add the peer-gateway command on the NX7K vpc domain

let us know the result

Bye

View solution in original post

3 REPLIES 3
Franck Zana
Beginner

Try to add the peer-gateway command on the NX7K vpc domain

let us know the result

Bye

View solution in original post

IT WORKS PROPERLY FINALLY!!!!

THANKS A LOT!!

I'll keep monitoring and testing the switches just in case

THANKS AGAIN!!!!

Domenico, so what did actually fix your issue? the peer-gateway command?