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Questions tagged [vpc]

For questions about the Cisco developed Virtual Port Channel (vPC) technology. For instance, you want to stack two Nexus 7000 switches or you are troubleshooting a problem with a Nexus 2000 fabric extender.

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24 views

AWS site-to-site VPN and multiple account VPC connections

I've configured a site-to-site VPN from our firewall (watchguard) to AWS. Now, how can I connect Account A with Account B? I've already an OpenVPN server in account A to which account B connects (...
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1answer
20 views

Why CIDR block is assigned to subnet? [duplicate]

If VPC is assigned CIDR block 172.31.0.0/16, then I can create sub-nets within VPC, following this procedure: 172 . 31 . 0 . 0 255 . ...
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2answers
144 views

spanning tree RootGuard question on vPC switches

I have following diagram and two distribution switch connected back to back over vPC Related spanning-tree question is it ok to use RootGuard on both distribution switch where access switch is ...
2
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1answer
44 views

Regarding Tier0 switch to downstream servers connectivity

I have been reading up on the connectivity patterns of tier0 switch to the downstream servers in a cloud environment(e.g. AWS, Google clouds), however, I am curious to understand why none of the cloud ...
2
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1answer
293 views

Why did Netflix choose to use CIDR blocks of 100.64.0.0/10 as its private network IP space?

Netflix gave a public tech-talk explaining their network, and one specific design puzzled me. See Page 25 at this talk (Netflix's Migration into VPC), they seemed to choose to use 100.64.0.0/10 as ...
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2answers
1k views

Cisco Nexus vPC LACP bonding with server issue

I am configuring vPC end to end till my server to get more bandwidth, and following is my scenario I am seeing one strange thing which is i configured vPC on N3k switch and then i configured my ...
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0answers
117 views

Amazon AWS VPN Bidirectional Device Access

After setting up an Amazon VPN connection and configuring my gateway using the downloaded configuration, I am able to directly ssh to the private IP of an EC2 instance in my VPC. However, both the EC2 ...
2
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1answer
838 views

Bridge Assurance with vPC on port type network

I'm running two Nexus 3048 switches as network core and I got an issue when linking another switch (specifically a 2960-X) on the vPC links. Consider the scenario: +-------+ +-------+ | NX #1 |===|...
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2answers
999 views

Cisco ASA vPC configuration issue

I have this scenario and trying to configure vPC for Cisco ASA 5585 (Active-Standby) Nexus vPC config: interface port-channel1 switchport mode trunk switchport trunk allowed vlan 10 speed ...
3
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2answers
407 views

vPC traffic flow question

This is going to be new network in my datacenter and i have question related vPC, as you can see i have A1/A2 switch (L3/L2 routing) in aggregation layer and C1/C2 switches for Core (L3 routing). I am ...
2
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1answer
299 views

vPC problems between nexus 5k’s and 4500

So I need help. I’m not at work, so posting config isn’t really an option, but here goes: I have a 4500 with a port channel to two Nexus 5k’s. There are two ports to each 5k all in the same port ...
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1answer
1k views

Nexus VPC Peer Link - does it carry unicast traffic?

Read from the doc that the VPC peer link only carry multicast/broadcast traffic under normal circumstances -> The vPC peer link carries control traffic between two vPC switches and also multicast, ...
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2answers
357 views

GNS3 - configure two DHCP servers within one VLAN

I have the following configuration: I would like to provide every host from VLAN_101 with DHCP-provided IP addresses. There are two DHCP servers running - one grants adresses for every host below ...
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2answers
317 views

VSS back to back like vPC back to back

I know vPC back to back to avoid spanning tree between two pairs of Nexus. But I've two 4500 pairs and I need to connect them. Is there a way to do something similar to the vPC back to back to don't ...
1
vote
1answer
381 views

Single homed, dual homed and double sided vpc

I'm trying to figure out scenarios in which one would use single homed, dual homed and double sided vpc and what benefits each topology would have? I can already see that dual homed vpc would have ...
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2answers
612 views

Fabricpath or vpc back to back

have two DC, with 2 N5K on each DC. I want to connect these pairs with Fabricpath to have full bandwidth used. I've seen that vPC back to back can do the trick. BUT Fabricpath brings vPC+ with it, ...
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2answers
2k views

vpc loop avoidance scenario

Consider the attached topology. There is a vPC domain, with vPC 20 for Sw2 and vPC 10 for Sw1. vPC peer link exists between NxOS1 and NxOS2. Suppose, Sw2 sends broadcast traffic.This broadcast ...
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0answers
1k views

Regarding vPC Dual Active or Split Brain scenario

Consider the below topology: Imagine that both the vPC peer keepalive link and vPC peer link have gone down. I am trying to understand how will that lead to unpredictable traffic flows or loops. ...
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1answer
759 views

Gateway on Nexus 3500 with VPC

I am testing a setup with 2 Nexus 3524 and a 2960X in a VPC Topology : For this test lab, I miss some SFP so there's only one physical link between each switch (and those link are copper using ...
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2answers
433 views

mLACP or vPC on L3 interfaces

I just want to know if it's possible to implement mLACP (with VSS) or vPC on L3 interfaces. I just can't find any answer to this on cisco doc. Thanks,
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1answer
1k views

Understanding virtual port channel peer switch command

1.I understand that irrespective of the STP priority, vPC primary always sends the BPDUs.The vPC secondary device will just proxy those BPDUs. Please confirm if the above understanding is correct. 2....
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2answers
347 views

Virtual port channel topology with firewall

Is it possible to implement the below topology? I see that there is a port channel going downstream to the firewalls. By any chance, are the firewalls running as one virtual entity? As we see here are ...
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2answers
917 views

Regarding traffic blackholing in case of vpc and hsrp

From the cisco docs i have: "vPC and HSRP/VRRP Object Tracking As Figure 67 suggests, it’s important not to use HSRP/VRRP link tracking in a vPC configuration. Assume HSRP/VRRP object tracking is ...
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1answer
214 views

Etherchannel Basics

Assume we have 2 switches connected back to back with 2 links as shown below: Please see the attached image. In traditional STP environment,one link will be blocked to avoid Layer2 loops. So ...
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2answers
1k views

How can a Class B network be in the 10.0.0.0 space? [closed]

I'm taking an AWS Lab to better familiarize myself with creating a VPC. The instructions describe the example network we are to create in the lab like so: My background is in software, not ...
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1answer
315 views

vPC over Dark Fiber

Recently, I was asked to implement vPC connections over Dark Fiber between two data centers. Is this possible, and, if it is possible, does it have any drawbacks or limitations? I'm asked to encrypt ...
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2answers
1k views

Nexus 5500 FEX Support

This design guide on networkcomputing.com states the following: When uplinking to Nexus 5Ks, one topology option is to dual-home the physical Fabric Extender. Dual-homing a FEX provides path ...
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1answer
2k views

Alternatives to VSS and vPC?

Is there any alternative to Cisco's VSS or vPC? I mean not with other vendors, just Cisco? Because I'm planning a new network design here in our company and I'm not really sure, if there's an ...
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2answers
1k views

Stacking Cisco Catalyst 3850 via Fibre?

I'm working at several new network concepts for our company and the challenge is to stack at least two Catalyst 3850 over a distance of 200-300 meters. I know there are other possibilities like VSS or ...
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1answer
1k views

Cisco Nexus vpc card type mismatch

I have a pair of Nexus switches configured for vPCs. In several cases, it is working correctly: core01# sh vpc consistency-parameters int po40 Legend: Type 1 : vPC will be suspended in ...
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1answer
2k views

Is it possible to implement IPSec with failover between one pfSense firewall and Amazon VPC (no BGP)

I'm trying to create a VPN connexion between my firewall (a pfsense 2.0.1) and my Amazon Virtual Private Cloud (VPC). Amazon provides two peers endpoints to mount two IPsec tunnels on the same VPC. ...
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1answer
1k views

Cisco Nexus 5000 VTP trunk status in vPC consistency-parameter

In a pair of Nexus 5000, the show vpc consistency-parameters command displays VTP trunk status on only one Nexus Enabled. The config is identical, what is the reason for the discrepancy? # sh vpc ...
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3answers
6k views

Juniper equivalent to Cisco's vPC?

I'm looking to implement a new network design with Juniper EX Series switches. Part of this involves implementing vPC between my core and ToR switches (and also between ToR and host). The goal is to ...
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1answer
905 views

NX-OS: Importing already mirrored config into a switch-profile

I'm running NX-OS version 5.2(1)N1(5) on a pair of Nexus 5020s that are mirrors of each other for all intents and purposes. After OS upgrades some of the configuration that was inside the switch-...
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1answer
10k views

Can adding VLANs to a VPC be done hot?

In this scenario, we have a VPC '17', consisting of two single port port-channels 'po17'. There are 2 x N5K's (5548s) - so po17 from both sides combine to create the VPC. The downstream devices are ...
12
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1answer
4k views

NX-OS peer-switch issues with 6500 VSS

I'm bringing up a new pair of Nexus 5500s running NX-OS 5.2 and I'd like to make use of the new vPC Peer Switch feature: The Virtual Port Channel (vPC) peer switch feature addresses performance ...
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3answers
4k views

OSPF over vPC on Nexus7k

I'm trying to help a friend with some Nexus issues. The topology is like this: Cat 3750 stack -> vPC -> 2x N7k -> LACP -> Fortigate firewall cluster The 3750 stack is running OSPF to both the ...