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Beginner

FI 6248 Nexus 5548 Port-channel problem

                   Hi all

I have a strange behavior between 2 FI and 2 nexus 5k configured as VPC , From a remote location and from my desktop I can ping odd ip and not even , from an other desktop in the same LAN the reverse, for both the tracert are good.

The only solution is to shutdown  ports 1/1-2 on nexus A or FI A and in that case both desktops can ping both IP.

All seems OK, no log error , no error on interface , I give below some commands

What thing to know is that the nexus b has a L3 card , not the Nexus A , In fact I am waiting for a spare L3 daughter card.

On both NexusI have such configuration and status

interface port-channel201
  description ucs-Fab-a
  switchport mode trunk
  switchport trunk native vlan 999
  spanning-tree port type edge trunk
  vpc 201

UCSM-PARIS-A(SSI153000ST)
                       Eth1/1        129    S I s     UCS-FI-6248UP Eth1/11

UCSM-PARIS-A(SSI153000ST)
                       Eth1/2        174    S I s     UCS-FI-6248UP Eth1/12


sh port-channel summary
201   Po201(SU)   Eth      LACP      Eth1/1(P)    Eth1/2(P)


sh mac address-table dynamic | i 1010

* 1010     0025.b5c9.481e    dynamic   0          F    F  Po201
* 1010     0025.b5c9.481f    dynamic   10         F    F  Po201


sh ip arp

10.203.136.21   00:01:05  0025.b5c9.481f  Vlan1010
10.203.136.22   00:12:43  0025.b5c9.481e  Vlan1010

On both FI A have such configuration and status

terface port-channel201
  description U: Uplink
  switchport mode trunk
  pinning border
  switchport trunk native vlan 999
  switchport trunk allowed vlan 1,104,999,1010-1013,1020-1021,1500-1502,1510-151
2,1550-1552,1560-1561,1600-1602,1610-1619
  speed 10000


sh port-channel summary
201   Po201(SU)   Eth      LACP      Eth1/9(P)    Eth1/10(P)   Eth1/11(P)
                                     Eth1/12(P)

sh mac address-table dynamic
* 1010     0025.b5c9.481e    dynamic   0          F    F  Po201
* 1010     0025.b5c9.481f    dynamic   0          F    F  Po201

sh cdp nei

E2RTR001(SSI1608085E)  Eth1/9          120     S I s       N5K-C5548UP   Eth1/1

E2RTR001(SSI1608085E)  Eth1/10         120     S I s       N5K-C5548UP   Eth1/2

E2RTR002(SSI16080F17)  Eth1/11         151     R S I s     N5K-C5548UP   Eth1/1

E2RTR002(SSI16080F17)  Eth1/12         136     R S I s     N5K-C5548UP   Eth1/2

Any ideas, A configuration I forgot on FI ?

Regards .

Everyone's tags (6)
3 REPLIES 3
Cisco Employee

FI 6248 Nexus 5548 Port-channel problem

Do you use the 5548-L3 for any routing? Note that having asymetric routing in vPC pair of Nexus 5500s is not supported and yields unexpected forwarding behavior.

Beginner

FI 6248 Nexus 5548 Port-channel problem

In fact in the probem I described the path is Esx -> FAB A - > N5K-A (for layer 2) -> N5K-B (for L3) -> routing to the LAN

And what you told me is that such configuration is not supported with VPC configuration , so I need to wait to receive the L3 card for the N5k-A. and check later if I have the same problem.

thanks

Cisco Employee

FI 6248 Nexus 5548 Port-channel problem

Correct.. You should not see this problem once you install L3 module in the N5K-A and implement a gateway redundancy protocol.

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