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.
106
questions
0
votes
1
answer
258
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 ...
CommunityBot
- 1
0
votes
1
answer
42
views
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 ...
- 67.9k
0
votes
2
answers
80
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 ...
- 2,539
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) ...
- 86.4k
1
vote
2
answers
183
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 ...
- 86.4k
7
votes
7
answers
3k
views
Redundant IP link aggregation for failover operation without route failure detection
I am looking for a technology to achieve TCP connection fault tolerance with the help of two links between hosts and without time delays for route failure detection. Something like this:
...
- 11
8
votes
4
answers
3k
views
Expanding an HP IRF topology
I'm examining options for a future expansion of our infrastructure. We rent space at a colo so we don't have a dedicated datacenter of our own. This means that our next major expansion will likely ...
2
votes
2
answers
884
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 ...
- 86.4k
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:...
CommunityBot
- 1
1
vote
2
answers
75
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 ...
- 86.4k
0
votes
2
answers
369
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 ...
CommunityBot
- 1
0
votes
2
answers
835
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 ...
- 21
1
vote
2
answers
176
views
i have two gateways for destination for single route
i have two gateways for single route
Ex.
destination 172.20.100.4 gateways 10.22.0.9 and 10.192.168.18
I want to add both routes in my route add if one is fail traffic goes automatically from ...
- 846
0
votes
0
answers
67
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 ...
- 1
0
votes
1
answer
545
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 ...
- 86.4k
1
vote
1
answer
307
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 ...
CommunityBot
- 1
0
votes
1
answer
95
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 ...
- 86.4k
0
votes
2
answers
664
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?
- 86.4k
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 ...
- 86.4k
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 ...
- 19.8k
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 ...
- 86.4k
0
votes
0
answers
116
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), ...
- 101
1
vote
1
answer
95
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 ...
- 86.4k
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?
- 2,203
0
votes
0
answers
576
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 ...
- 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"...
- 433
3
votes
1
answer
877
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 ...
- 1
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 ...
- 27.4k
1
vote
1
answer
89
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 ...
- 86.4k
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 ...
- 30k
1
vote
0
answers
230
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 ...
- 11
3
votes
1
answer
934
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 ...
- 880
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 ...
- 8,846
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 ...
- 86.4k
2
votes
3
answers
5k
views
Optimizing Router Topology (Redundancy)
In the previous question I have been trying to optimize switching topology.
Now I would like to implement redundancy. And here are the problems I faced.
Assuming the following topology
As routers ...
- 11
2
votes
2
answers
960
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 ...
- 121
4
votes
2
answers
427
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 ...
- 100k
2
votes
1
answer
119
views
Lab: I am running 15.1 on a catalyst and need to disable redundant supervisormp
I am trying to find a way to disable the redundant supervisor mode in my switch, as it is disabling another line card, so it can have enough power to spare for a redundant slot I wont use.
I have ...
- 100k
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 ...
- 416
0
votes
1
answer
1k
views
ASR 100X series hardware redundancy?
I have very little knowledge of the Cisco ASR series. We are planning to buy a ASR 1001X series router, but I have a question related to hardware redundancy.
Do I need to buy two Cisco ASR series ...
- 100k
8
votes
2
answers
151
views
Will STP lose data whilst switching from a failed link?
In a network with a dual-redundant link between two switches, will any data be lost during the switchover from an active link to the blocked link when the active link fails?
- 100k
-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 ...
- 100k
5
votes
1
answer
391
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 ...
CommunityBot
- 1
5
votes
1
answer
860
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. ...
- 53
1
vote
1
answer
523
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 ...
- 86.4k
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 ...
- 30k
0
votes
2
answers
76
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 !!
- 16.3k
1
vote
1
answer
560
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 ...
CommunityBot
- 1
1
vote
1
answer
2k
views
Configuring redundancy Site to Site VPNs with different ISPs
I'm trying to configure two Site to Site VPNs from one Cisco ASA 5585x to two separate FWs with different ISPs. I found that multiple peer IP addresses can be configured under ASDM, Configuration > ...
CommunityBot
- 1
2
votes
2
answers
443
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 ...
- 100k