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Questions tagged [redundancy]

For questions about network redundancy. For instance: you need to design a new network with high redundancy or you are troubleshooting an issue where it doesn't work.

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Designing a web-facing network for redundancy and QoS (in a small business)

Summary How does one configure the web-facing part of a small business network for redundancy and quality of service? I mean ... we can have the control over our internal infrastructure, but what ...
iDontKnow's user avatar
0 votes
2 answers
43 views

ASA - Redundancy ISP in Multiple contexts

At the moment I am interested in the fault tolerance of the route to providers in Cisco ASA in multiple contexts. As I know, in one context you cannot track the route and change it, but the task is to ...
Глеб Щеголев's user avatar
1 vote
2 answers
155 views

Is there any protocol between MAC layer and PHY layer?

If I read the IEEE 802.3 spec. correctly, there has no protocol between the MAC layer and PHY layer. There's only a few signals such as signaling whether PHY is ready for transmission and whether MAC ...
Fox's user avatar
  • 13
2 votes
2 answers
761 views

Can LACP connect to 2 different firewalls?

I'm in the process of redesigning my network and have a few questions about LACP configuration: Can LACP be set up to connect to two different firewalls? In the diagram I provided, there are three ...
kevin's user avatar
  • 33
11 votes
5 answers
5k views

Why are rings not a favorite option in IT networks?

I'm an engineer in the automation field. I've been switching slowly to networking. I've started in the automation world 12 years ago. With an automation mindset, we use rings (like MRP rings) ...
AhmedWas's user avatar
  • 273
1 vote
2 answers
72 views

Alternative Solution to Avoid Loop aside STP

SITUATION: I have two switches SW1 and SW2. These two switches are connected with two trunk ports. While SW1 is connected to PC1, SW2 is connected to PC2.  If PC1 sends a broadcast frame to PC2 via ...
Adekunle's user avatar
0 votes
1 answer
250 views

Can anyone explain the introduction of Rapid Dual Homing to me?what is the main function of rapid dual homing?

I read some information about Rapid Dual Homing from JetNet 5020G,the figure below is the introduction of Rapid Dual Homing. Honestly,i don't understand why can the rapid dual homing have multiple ...
user16266657's user avatar
0 votes
2 answers
793 views

OSPF with 2 Routers, N redundant links

I'm having a hard time trying to find a solution, and I can't seem to find anywhere on the web exactly what I need. We need to configure 2 Routers (MOXA EDR 810) to have N redundant links between one ...
ospf_newbie's user avatar
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0 answers
64 views

Dual Juniper MX80 problem

We have 2x Juniper MX80 routers with only one currently being actively used. Second one is waiting to take over in the event of disaster. We also have two ISP's that deliver network to our MX80. We ...
Roman's user avatar
  • 1
0 votes
1 answer
492 views

Non [R]STP switches in LAN ring topology

I am revamping a simple network, which is based on cascaded, standard, unmanaged PoE switches. I am also adding a redundant loop closing wire, from the last switch to the first one, which at the ...
PeppeA82's user avatar
0 votes
2 answers
355 views

How to Balance SPAN Traffic from Redundant Switches

So we are wanting to deploy an IDS device to capture EAST-WEST traffic in a LAN. The actual topology is more complicated but our issue boils down to this: We are attempting to configure SPAN sessions ...
TaranYourAss's user avatar
0 votes
1 answer
89 views

What are the benefits and drawbacks of NSPOF networks over SPOF ones? [closed]

NSPOF has redundant links and redundant network components, so I think the biggest benefit it has over SPOF is high fault tolerance and the biggest drawback is the high cost of buying and maintaining ...
Jin Yu Li's user avatar
0 votes
2 answers
622 views

Aggregation links and RSTP

If aggregation links are used for redundancy to ensure the devices stay active if a link fails, does RSTP need to be configured due to there being 2 links?
The_Bear's user avatar
  • 515
0 votes
1 answer
23 views

Server replication HA [closed]

I have a server connected to a switch, to ensure the server has HA, I want to replicate this server. To do so, do I connect the replicated server to the same switch as the primary server. Or do I need ...
user10776032's user avatar
7 votes
2 answers
1k views

5 nines, how is it built from 4 nines links

How is 5 nines calculated using lesser reliable links? For example, we have 2 x 4 nines connections used in an active/active setup... which supposedly equates to 5 nines, but I don't buy it... how ...
user10021657's user avatar
0 votes
1 answer
1k views

Layer 2 redundant network and OSPF

What is a recommended way (in terms of maintenance, simplicity and failsafe-ness) to essentially run a "ring" of switches, but allowing OSPF to run properly (so equal-cost-path routing can work - in ...
JacquesL's user avatar
0 votes
0 answers
114 views

pfSense: Bundling carp VIPs

When configuring Carp for pfSense as recommended by their guide, this issue appears: when pulling out the WAN cable (simulating, say, a cable failure, switch port failure, or network card failure), ...
aphid's user avatar
  • 101
1 vote
1 answer
287 views

Fastest way to switch between redundant wireless links

I have a system using 2 redundant point-to-point wireless links to access the internet, and I'm trying to find the fastest way to switch between them if one goes down. We need to switch within 1 ...
Selvek's user avatar
  • 123
1 vote
1 answer
91 views

CRC R bit size to guarantee error free

For a Link Layer frame, it's common to include some bits for redundancy. Suppose we have a frame with X bits of actual data, and want Y bits of error-correction bits. What size do we need to choose ...
rahul chawla's user avatar
1 vote
2 answers
4k views

Switch Stacking and Redundancy

If switches are stacked together using StackWise, what happens if one of the switches goes down? Is switch stacking bad for redundancy?
Tim's user avatar
  • 11
0 votes
0 answers
554 views

High Availability in Cisco4331 with sync feature

Few weeks ago i had asked help regarding the High Availablity in Cisco 4331 and recently i managed to sort it out with the help i got here. Here is the link to it: High availability confiugration in ...
de.walkar's user avatar
  • 433
0 votes
2 answers
4k views

High availability confiugration in Cisco 4331 routers

I need to configure high availability for 2 Cisco 4331 routers. First i was planning to configure using HSRP but later i realized there is another way around called as "stateful Interchasis Redundancy"...
de.walkar's user avatar
  • 433
2 votes
2 answers
2k views

How to know if ISP network have multiple routes

When it is time to choose an ISP in a remote area, I hope that the chosen ISP is having an acceptable redundancy in his network. Is there any way to verify all different route an ISP is having in his ...
rainvillem's user avatar
3 votes
1 answer
868 views

Cisco - supervisor reset without disabling interfaces

After power loss we have an issue with supervisor on 4500~ cisco switch. Peer (slot: 3) information is not available because it is in 'DISABLED' state But interfaces that are in that card are ...
szkolek's user avatar
  • 31
1 vote
1 answer
88 views

Installing a redundant system in parallel routing

I have a legacy automation system which will be replaced by a newer version. As an fallback option, the new system will be installed in parallel to the old one. But only one will be "in control". Due ...
why.n0t's user avatar
  • 113
1 vote
0 answers
211 views

Colocation network setup - 2 switches with each 1 uplink - redundant configuration question [closed]

I have a question about the network configuration when connecting 2 switches in a colocation rack via 2 uplinks (1 uplink to each switch) to 2 other switches of the datacenter itself. My topology ...
Andreas B.'s user avatar
3 votes
1 answer
1k views

High Availability for ISR 4431 IPSec VPNs

I have the following lab setup in GNS3. R1 & R2 are VPN endpoint at my datacenters and R3 is simulating a remote site. What i'm trying to accomplish is having one tunnel from R3 to the ...
Kyle's user avatar
  • 208
3 votes
1 answer
898 views

HPE IRF Stack why do I need two physical ports?

I'm building exactly the same topology, but there is no explanation why do I need two physical interfaces in IRF stack? So, can someone please explain me, why do I need two physical members in IRF ...
xxx's user avatar
  • 31
9 votes
3 answers
5k views

I have a single ethernet switch. Should I use spanning tree?

I have a single ethernet switch. Should I use spanning tree? If there is a redundant link, definitely need to enable STP. In a single switch, how is it possible to have a redundant link? Any other ...
Maha's user avatar
  • 155
4 votes
2 answers
3k views

Network Redundancy with LACP Trunking

I would like to set up a redundant link between two switches. I have four ports available to accomplish this. Scenario A: Switch 1 has ports 1+2 trunked together via LACP. They are plugged into ...
jbakerj's user avatar
  • 53
2 votes
1 answer
1k views

4507r Supervisor engines aren't operating redundantly

The tl;dr : I have two supervisor engines in a 4507r but the standby unit doesn't appear to be ready to perform when the active module dies. On Sunday I had a network problem that appeared to be ISP ...
user208145's user avatar
5 votes
1 answer
830 views

How does STP convergence work?

Consider the IEEE 802.1D (first revision) Spanning Tree Protocol. I have read a lot of articles and forum entries about STP convergence. Often I do find contradictions about the convergence mechanics. ...
cmatef8's user avatar
  • 53
1 vote
1 answer
510 views

PVST + MST + RSTP network. Possible to make it work?

I have got a network (around 100 switches) which looks like this: Cisco 2960 - can do PVST, RSTP, MST MRV mr2228-s2c - can do STA, MSTP HP 1810 - can do RSTP, STP Two main Ciscos are linked with ...
Josef Novák's user avatar
7 votes
0 answers
2k views

HSRP IPv6 configuration

Looking at the Cisco documentation for HSRP IPv6 configuration I noticed the use of 'standby 1 ipv6 autoconfig'. interface FastEthernet0/0 no ip address duplex auto speed auto ipv6 address 2020:...
dcrearer's user avatar
  • 499
5 votes
1 answer
383 views

Is it bad practice to use a Virtual Router for NTP-Clustering?

I'm trying to find information on whether it is possible to enable an NTP cluster containing multiple routers, that are configured with VRRP to share the same address. I am aware that with many ...
cyacedev's user avatar
2 votes
2 answers
931 views

How to connect high-availability routers to high-availability firewalls

I have two Juniper routers (a SRX340 and a SRX320), each with a leased line, on the same IP range. They are designed to be connected together on specific network ports so that the SRX320 takes over if ...
matthewk's user avatar
  • 121
6 votes
2 answers
106 views

Network Ten LTE Hubs Into One Network

I'm working through a tricky situation getting a field office set up out in a very rural area. There are ten 12' x 60' trailers being set up (2-3 metres apart from one another), each with varying ...
Markus's user avatar
  • 63
0 votes
2 answers
74 views

Cisco 220 Switch fail over

we have a Cisco 220 Switch, how to fail over this switch, in other words how to have another switch that activates when the first dies? Thanks !!
MrCoder's user avatar
1 vote
1 answer
549 views

Pfsense CARP mutliwan

I'm currently trying to build a HA setup using Pfsense/CARP for the first time but i have a few questions about it. On the LAN side i have 3 VLAN's and they failover fine using CARP, the problem is ...
janvandeanker's user avatar
2 votes
2 answers
442 views

redundant vpn to remote location with redundant links

I have this situation: Remote location with 6 devices collecting data and each connected to two VPN routers. Bonding is set up for those computers and data is sent to multicast address. Each VPN ...
Metaathron's user avatar
1 vote
1 answer
189 views

Can a router run GLBP for two subnets simultaneously on separate interfaces?

If I have a simple topology with three routers, R2 -- stub area 1 / ISP ----- R1 \ R3 -- stub area 2 and I want to alleviate both R2 and R3 from ...
Y     e     z's user avatar
3 votes
2 answers
2k views

Connect two routers to a single uplink for full redundancy

I have a single uplink with my ISP at a data center. I have 2 routers (CISCO 3850). How do I connect these routers to that uplink WITHOUT a network switch? That switch will be a single point of ...
Igor Chulkov's user avatar
-1 votes
1 answer
1k views

How to implement Layer 3 (OSPF, IS-IS) link redundancy?

I think this kind of topic may be a course basic, but I'm still have a lot of technical doubts on how to implement redundant links on Layer 3, for example: -In order to use dual homing for a remote ...
user44330's user avatar
0 votes
1 answer
58 views

VDSL to LTE redundancy over 2 different CPEs suitable for small business

We would like to build up a full redundant internet access to our small business location. We have currently VDSL connection and would like to create a redundant connection over LTE as a backup. In ...
Tolga's user avatar
  • 113
4 votes
2 answers
418 views

OSPF Issue, redundancy between P2P (MPLS) and Firewall

I drew a diagram for the network to make it easy to understand my network issue. Site B,C and D communicate through MPLS and in case of failover they communicate through VPN tunnels. Site X ...
m.alkishawi's user avatar
1 vote
1 answer
86 views

Packet forwarding in HSR?

Does a node forward a packet further, even if the destination node is itself?
jannarc's user avatar
  • 35
2 votes
1 answer
4k views

ASA Redendent Failover and stateful link issue

We have ASA 5585-X and i create back-to-back (without intermediate switch/hub) two 1G cable between two ASA to create failover + stateful link using g0/6 and g0/7 interface. Interface config ! ...
Satish's user avatar
  • 4,379
1 vote
2 answers
292 views

Network redundancy with low cost switches in a ring

I'm designing a network which is physically arranged like: |---------------------------[router]---------------------------| | | |--[s]--[s]...
Elliot Woods's user avatar
1 vote
2 answers
3k views

Fortigate VRRP or HA config

I have 2xFG 600D for redundancy setup, where to use VRRP and HA configuration? which one is optimal for Nat mode ?
IT Tech's user avatar
  • 41
0 votes
1 answer
130 views

Running quagga on a redundant board? (how to force ospfd to not send HELLOs?)

In the image below i run quagga ospfd daemons as routers in picture. I want to add 1+1 redundancy to 172.16.1.0 network this way: if 172.16.1.1 became unavailable 172.16.1.128 changes its IP address ...
mhk's user avatar
  • 135