Nexus 5548UP connectivity with Cisco router 2811.

[Ashok Basapure]

               In the existing network we have Cisco 2811 router connected to Corporate MPLS cloud. Cisco 2811 is connected to Catalyst 6509 switch(set based IOS with MSFC card). Along with that we have two Catalyst 5509. We are upgrading the access layer by replacing catalyst switches with Nexus 5548 & 2248.

For a purpose of testing I have connected 5548 & 2248. Created cPC and ether channels between two. SVI and HSRP configuredon 5548. I am terminating 2651 (test router) on 2248 port 101/1/1. On 5548 I have enabled EIGRP on vlans. I am unable to ping to 2651 from nexus switch 5548 and vice-versa.

I can see both devices on CDP but I do not see eigrp neighborship formed.

What configuration should go in 2248 and 2651 in order to establish a connection between two? If test is successful then I will connect 2811 to 2248 during actual migration. I assume that in testing if it works for 2651 then it must work on 2811 router.

[Jerry Ye]

vPC will forward on all path while STP will block a path to avoid loop.

If you remove vpc peer-link, you topology will just like your Catalyst 6500s.

Regards,

jerry

[Ashok Basapure]

Jerry,

Thanks for an update.

I will setup a network as below:

1) STP between N5K-1 & N5K-2.

2) All four N2K will be in dual-homed with N5K-1 & N5K-2.

3) STP between two N5Ks & four N2Ks.

What is the role of HSRP in new setup?

This may not be the best design but I have to stick to the existing network set-up.

Thanks

Ashok

[Jerry Ye]

No. 2 cannot be done. Since it will run STP, all FEXs will be single homed.

In terms of HSRP, you can follow your C6K set up, nothing special.

Regards,

jerry

[Ashok Basapure]

Jerry,

In existing production network we do not have HSRP on C6K.

Is there any value addition if I enable HSRP between two N5K?

Thanks

Ashok

[Ashok Basapure]

Jerry,

After removing the vPC, do I need to associate the fex. ( Do I need following commands post STP configuration)

N5K-1(config)# interface port-channel 101
N5K-1(config-if)# switchport mode fex-fabric
N5K-1(config-if)# fex associate 101
N5K-1(config-if)# exit

N5K-1(config)# interface port-channel 102
N5K-1(config-if)# switchport mode fex-fabric
N5K-1(config-if)# fex associate 102
N5K-1(config-if)# exit

N5K-1(config)# interface port-channel 103
N5K-1(config-if)# switchport mode fex-fabric
N5K-1(config-if)# fex associate 103
N5K-1(config-if)# exit

N5K-1(config)# interface port-channel 104
N5K-1(config-if)# switchport mode fex-fabric
N5K-1(config-if)# fex associate 104
N5K-1(config-if)# exit

Thanks

Ashok

[Jerry Ye]

FEX needs to provision the same way. However, they will be connected as single-homed solution (non-vPC).

In terms of HSRP, the following can get you going:

interface vlan xx

  ip address x.x.x.x/x

  hsrp version 2

  hsrp xx

   ip y.y.y.y <

  priority 105 <

  preempt

Please use the following link as reference.

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/unicast/5_0_3_N1_1/l3_hsrp.html

HTH,

jerry

[Ashok Basapure]

Jerry,

Jerry,

Today I have setup a network with STP connection.

N5K-1# sh fex

FEX FEX FEX FEX

Number Description State Model Serial

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

101 FEX0101 Online N2K-C2248TP-1GE SSI16220DBB

102 FEX0102 Online N2K-C2248TP-1GE SSI16210X2B

103 FEX0103 Online N2K-C2248TP-1GE SSI16210HGK

104 FEX0104 Online N2K-C2248TP-1GE SSI16210GCC

N5K-2# sh fex

FEX FEX FEX FEX

Number Description State Model Serial

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

103 FEX0103 Offline N2K-C2248TP-1GE SSI16210GCC

--- -------- Offline N2K-C2248TP-1GE SSI16210HGK

--- -------- Offline N2K-C2248TP-1GE SSI16220DBB

--- -------- Offline N2K-C2248TP-1GE SSI16210X2B

N5K-2#

On second switch I am not seeing other fex populated. What might be the problem?

Thanks

Ashok

[Jerry Ye]

Like I said before, you have removed vPC and you need to home each FEX directly to the N5K (recable).

Regards,

jerry

[Ashok Basapure]

Jerry,

I have 4 Fex and two 5548. I did not understand "you need to home each FEX 

directly to the N5K (recable). "

Can you pls explain or paste the diagram?

Suppose with proper module and trans-receiver I would have connected Cisco 2811 router to 5548 directly then in that case do I still need to have separate router vlan from vPC peer-link?

Thanks

Ashok

[Jerry Ye]

Please see below. This is what I mean:

HTH,

jerry

[Ashok Basapure]

Jerry,

What is circle around two cables indicates ( Between N5K & N2K)?

I have two Cat 4510. Now I have connected one cable to N5K-1 and 2nd cable connected to second N5K-2. I have configured tunk between two. 2nd C4510 I have connected in similar fashion.

Thanks for help till now.

Thanks

Ashok

[Leo Laohoo]

What is circle around two cables indicates ( Between N5K & N2K)?

vPC

[Jerry Ye]

Hi Leo and Ashok,

Actually, I used the wrong circles. Those are regular port-channels. =)

Regards,

jerry

[Ashok Basapure]

leolaohoo,

As per Jerry in my scenario no vPC is required.

Thanks

Ashok

[Ashok Basapure]

Jerry,

Thanks for comment on circle 'Actually, I used the wrong circles. Those are regular port-channels. =)"

SUMMARY:

1) No vPC any where.

2) Etherchannel between N5K-1 & FEX 101 & 102

3) Etherchannel between N5K-2 & FEX 103 & 104

4) Etherchannel between N5K-1 & N5K-2

5) Etherchannel between N5K-1 & Cisco 4510 - 1

6) Etherchannel between N5K-2 & Cisco 4510 - 2

HSRP between N5K-1 & N5K-2

Pls let me know you view.

Thanks

Ashok