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Beginner

L3 Router connected to Pair of 5500 Series, traffic hitting secondary one instead of primary

Hello,

I have an issue where traffic going to a pair of nexus (5548UP) is hitting the secondary one instead of the primary one. I have one router dual homed to both nexus via routed ports (runs ospf). Both is connected to a 4500 series switch in vpc. This setup works fine. From a pc behind the 4500 switch, when i ping the router interface connected to Nexus-1, it goes through primary nexus which is Nexus-1. I have dual-homed another router to both nexus with same setup as mentioned above., but now when i ping the router interface connected to Nexus-1 from the PC behind the 4500 series switch, the traffic goes to the secondary nexus. Is this something normal? I want the traffic to hit Nexus-1 since the router interface i am pinging is connected to Nexus 1

Any advice, anything i am doing wrong?

Thanks

Everyone's tags (2)
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VIP Expert

Hi,

Hi,

Since the 5ks are running layer-3 with the routers, can you enable "peer-gateway" command on both Nexus and than test again?

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/mkt_ops_guides/513_n1_1/n5k_L3_w_vpc_5500platform.html

Figure-5-3

HTH

Beginner

Hello Reza

Hello Reza

thanks. I have done so, but still it does not work, it is still going to the secondary nexus. Any ideas?

Beginner

In the Document you sent me,

In the Document you sent me, my topology looks like figure 5-7. The Router is not VPc'd to the nexus. 

VIP Expert

Hi,

Hi,

So, do you have a layer-3 connection between the 5ks as shown in figure 5-7?

Beginner

yes. exactly as in figure 5-7

yes. exactly as in figure 5-7

VIP Expert

So, when you do a trace route

So, when you do a trace route from the PC sitting behind the 4500 (layer-2) does it go 5k-2 first and than across the layer-3 link and than 5k-1?

is there HSRP between the 5ks

Beginner

when i trace route it goes to

when i trace route it goes to 5k-2 and then directly to the router across the Layer 3 link. Yes HSRP between 5k, active on all vlans being the primary nexus.

VIP Expert

I think the case when VPC is

I think the case when VPC is configured on the Nexus.  Even though 5k-2 is backup HSRP, it will still froward traffic upstream and will not send it to HSRP active for forwarding.

HTH

Beginner

so you mean the behavior is

so you mean the behavior is normal, traffic destined for router interface connected to nexus-1 should be hitting nexus-2? i have same setup for another router and it goes through nexus-1

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