Questions tagged [failover]

For questions about failover in a network aspect. For instance, if you have a stack of switches and you have problems with master/slave failover or a Firewall setup with multiple hot standby's where it doesn't failover correctly. Failover can also be used in relation to a network design.

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ASA cluster with named interface running PPPoE

I am trying to configure an A/S firewall cluster, and I have the interface configured as a PPPoE client. When I try to configure the clustering on ASDM, I get a message saying that high availability ...
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2answers
1k views

Choosing between BGP (AS Number) and Dynamic DNS

I have a client that provides an online API service that requires 100% uptime but has been facing connectivity challenges from ISPs. They started out with one ISP (ISP-A), who of course when there ...
3
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1answer
773 views

How switch divert traffic to standby ASA when link to active ASA is down?

Active ASA and standby ASA communicates through failover link. If active ASA detects its interface to switch is down, then it tells the standby ASA and the standby ASA becomes active. How does the ...
4
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1answer
2k views

2-stacked switches with 2 uplinks to each ASA

My current single uplink from 2-stacked switches to ASA is not enough to cater the link utilization (upload traffic from the 2-stacked switches to ASA). So, I have thought of using 2 uplinks. If I use ...
8
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2answers
103 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?
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1answer
65 views

Is there such a thing as dual failover routers?

Are there any routers than can failover twice? like having 3 WAN ports or 2 WAN ports + a built-in 3G modem? Let's say like primary WAN is 100 mbps ethernet from ISP, secondary is a Cable Modem and ...
2
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1answer
606 views

Multiple Wan Nat with IP SLA

I am trying to setup IP SLA for my WAN interface and want the NAT to be setup to when the link goes down the NAT will switch over. Here is the config: version 15.5 track 1 ip sla 10 reachability ...
2
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1answer
1k views

Dell SonicWALL - TZ series Dual Wan

Can you use dual-WAN with Active/Passive failover on any of the TZ SonicWALL models?
4
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3answers
24k views

Load balancing with multiple ISP, two routers and firewall

I have two ISP connections on two Cisco 2901 routers, in front of Cisco ASA-5515 firewall. I need to configure failover load balancing network. Two Cisco 2901 router with dual (different ISP) ...
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1answer
529 views

How to manage Cisco ASA context in Active/Active failover

all. I have two Cisco ASA 5512-X in Active/Active faiover pair. And four context on them. Usually to edit configuration I go to admin context via SSH, than issue command "changeto context ...
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2answers
68 views

What is a good approach to develop internet access failover system?

I have 3 internet providers in the same environment, but distributed in different points/hosts. Sometimes a link is off while the others are okay. My idea is to centralize all connections in a server ...
3
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1answer
121 views

Cisco 2520 CGS - IP SLA Failover from FE0/1 to FE0/2 Possible?

Have two sites with Cisco 2520 grid switches connected over fibre (OPGW, to be precise). Site #1 is the existing site, with a 2520 connected to Site #2 (via fibre). There is an existing 3G backup ...
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2answers
954 views

How to properly configure STP in this simple setup?

In the network below, I have a simple setup of two hosts (R1 and R2). They both are connected to a L2 access switch. Both the L2 access switches are connected on two interfaces to the L3 distribution ...
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2answers
2k views

How to configure WAN backup with 2 ADSL boxes and 1 router?

I've got 2 IP over ADSL boxes (Orange & OVH) and 1 TP-LINK router to manage the possible failover of one link. When the Ethernet link between the primary box falls or when the bow itself is down, ...
2
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1answer
164 views

Small Business SIP Fail over multiple ISP's

Currently using a sonicwall but looking... small organization but calls are important. Is there a way to do a failover between two different ISP's and NOT have the sip traffic drop. We use a ...
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3answers
6k views

Dual ASA5510 with dual ISP failover

I am setting up a highly redundant network and want to run my two ASA's in failover mode - each with a link to a router connected to two different ISP's. The topology: My two 2911's are running BGP ...
2
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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. ...
3
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2answers
1k views

Switch Failover

I have two servers with two Ethernet ports each. I also have two managed Cisco switches. Is it remotely possible to have each server connect to each switch in a way to make the switches ...
8
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2answers
6k views

Is there an SNMP MIB for Cisco Track Objects

My goal is to write a service check that pulls the status of a Cisco track list that is performing a Boolean OR. I have a screen scraper in place currently, but that is really not ideal in terms of ...
9
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1answer
518 views

How to provide failover for space-diversity T1

I have inherited a small, insular, dedicated network which is essentially trouble-free, so naturally I want to improve it :-) I lowered my network knowledge and savvy to somewhere around a 2 to 3 on ...
2
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2answers
2k views

How to achieve Redundancy/Failover for two WAN links (not ISPs) ?

We have two wan data links (with two different telecom providers) going from our central office to a remote location. Each data link currently transfers data from different equipment that are in two ...
8
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1answer
5k views

How to failover static ipsec vpn tunnels?

I have a network with resilient gateways whereby Customer sites use a default gateway to reach the internet edge routers and the primary route for traffic uses a lower metric. ipsec tunnels are ...
4
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1answer
538 views

Is it possible to design an E1 redundancy with failover router and single E1 WAN link?

We have a single E1 line from ISP at one site, and a backup E1 line at other site. RAD DXC-10A have 4xE1 ports and used as E1 cross-connect. At each site we have single Cisco router with no backup. Is ...
4
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1answer
673 views

Cat6K parity failure and long SSO failover

From a Cat6K, RP crashinfo indicates parity error. Guidance seems to be to not do anything unless this happens more than once in 12-month period. At what point do you push Cisco for hardware or RAM ...
7
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5answers
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: ...
7
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2answers
1k views

Multiple WANs/Out-of-band (Cisco 1900)

I've got a Cisco 1900 router which connects to the Internet using a primary and a secondary WAN connection. When the primary connection is up, all traffic use this link. When the primary connection ...
7
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1answer
13k views

Timeouts for ASA VPN peers

I have configured a remote site with two IP addresses for data centre VPN peers - one primary (1.1.1.1), one backup (2.2.2.2). When the primary peer fails, the remote site detects the failure using ...
9
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2answers
8k views

pfSense multi-wan Bridge, NAT, Load balancing and CARP

Context I currently have : 1 pfSense 2.0.2 router (on a Firebox X-Peak X5000) 2 WAN 1 LAN 3 Servers My interfaces WAN1 68.XX.XXX.98 to 69.XX.XXX.102 WAN2 65.XXX.XXX.58 to 66.XXX.XXX.62 LAN 192.168....
10
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1answer
1k views

Firewall Replication

If I have two datacenter sites that are considered redundant to each other. Is it possible to sync firewall configuration from the primary to the backup? What is the best way to keep both firewalls ...
5
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3answers
314 views

Dual Circuit Health

I would like to know best practices for failing over onto a secondary MPLS or Internet circuit. I understand the concepts behind BGP and influencing in and outbound routes, however what I am looking ...
21
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5answers
27k views

Cisco ASA site-to-site VPN failover

We recently replaced international MPLS with new ASA 5510s and site-to-site VPNs. However, when we deployed this we ran into a problem where each remote location has 2 ISPs for redundancy, but when ...

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