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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21
votes
5answers
28k 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 ...
10
votes
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 ...
9
votes
1answer
550 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 ...
9
votes
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....
8
votes
2answers
115 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?
8
votes
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 ...
8
votes
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 ...
7
votes
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
votes
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
votes
1answer
14k 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 ...
6
votes
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 ...
5
votes
3answers
315 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 ...
4
votes
2answers
1k views

Multiple ISPs failover configuration

I'm going to be more explicit about this and hope you'll get me through I have two ISPs connected each one to a cisco ASA 5510.the two ASA are connected to a cisco switch 3650 that connects my LAN. I ...
4
votes
3answers
25k 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) ...
4
votes
1answer
686 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 ...
4
votes
2answers
1k views

High availability LAN segment with Cisco ISR4451X and 2 x Netgear GS724 - Port-channel vs. BDI vs. BVI?

I have a customer that is getting a new 1Gbps ISP connection and wants his servers connected across two switches for redundancy and protection from: failure of a router port failure of a network ...
4
votes
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 ...
4
votes
1answer
553 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
votes
2answers
241 views

How do you account for unreliable ISPs?

I maintain internet for a small business in a third-world country, and I am forever struggling with unreliable service from our ISPs. Our current setup uses a Peplink Balance 580 for load balancing, ...
3
votes
2answers
431 views

EIGRP failover - how do i verify it happened?

I have 2 links to a destination and EIGRP was setup. The faster link is the successor and the slower link is the feasible successor. Switch1#show ip eigrp topology 192.168.1.0 EIGRP-IPv4 Topology ...
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 ...
3
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2answers
1k views

Cisco 3825 Router - Dual WAN Failover?

My Cisco 3825, (ISR?) is running fine now, thanks to a lot of help. We've now gotten another WAN link from a different ISP for redundancy. What I need is to know how to configure the router to be ...
3
votes
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
votes
1answer
110 views

WAN failover when links stay up/up

If I have 2 possible outbound paths, 1 primary, 1 secondary, and I obviously need the secondary to come up if the primary fails. The problem I am foreseeing though, if the RF signal fails, the links ...
3
votes
1answer
804 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 ...
3
votes
1answer
124 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 ...
3
votes
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 ...
3
votes
2answers
2k views

how to setup dual ISP fail over with 2 routers

I have a project which i'm struggling with and wondered if someone can offer some advise on the best way to achieve my goal (i'm new to Juniper). At the moment I have 2 juniper srx240, one connected ...
3
votes
1answer
3k views

Active/Standby Cisco ASA failover without Sync

I have a pair of Cisco ASA 5585 firewalls in my network. I need to make some network changes on my network however we can have very little to no impact/downtime. I want to be able to make changes on ...
3
votes
0answers
995 views

Dual ISP NAT Failover Not Working

I have a Cisco 1841 router with an HWIC-4ESW switchport module attached to it. Fa0/0 is connected to ISP1 and Fa0/1 to ISP2 and both are "ip nat outside", the switchports are in interface Vlan 1, ...
2
votes
2answers
2k views

Cisco failover interface in waiting

I have following scenario, where i am getting 1G copper Cat6 cable from ISP and directly terminated on my Cisco ASA firewall on Gi0/8 interface and i have configured failover now my in failover output ...
2
votes
2answers
222 views

Failover with two ISPs, one with public and one with private addresses

I have the following setup: a small office network behind a Cisco 2900 series router. The network consists of about 20 devices - PCs, printers and switches. I have two ISPs that I want to configure ...
2
votes
1answer
77 views

Multhoming including incoming connections?

I am investingating the option of connecting our business network to 2 separate ISPs for redundancy. Since we have a couple of B2B services which need to be accessible from outside, in order to have ...
2
votes
2answers
416 views

Lowest Possible Failover Latency

Let’s say I have two networking devices (either L2 switches, L3 switches, or routers), and the two devices have two ethernet connections between them: port 1 to port 1, and port 2 to port 2. If one of ...
2
votes
3answers
2k views

Cisco ASA vs Router or Both

I have found a lot of articles asking the same question on other sites but seems to be a lot of back and forth with no agreement. I am new to networking working with VIRL and trying to learn Cisco ...
2
votes
1answer
3k views

ASA5550 manual failover question

We have two ASA5550 primary & secondary and they are pretty old running from since last couple year and we never bother to touch but recently we are doing some maintenance and found we need to ...
2
votes
1answer
56 views

Bonding and switching between 2 different Links/WANs/Interfaces

Before I ask anything, I'd like to say that I pretty much searched a lot (to what I know of from keywords and terms such as "bonding" "wans" "links" "failover" "aggregate") and I couldn't find any up ...
2
votes
2answers
294 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 ...
2
votes
1answer
637 views

Virtual IP failover issue with vmware exsi ip based hashing

We are deploying HA database cluster on exsi which based on virtual IP concept for failover. if One node fail reserved VIP will be assigned to another node we have two exsi nodes and two virtual ...
2
votes
1answer
2k 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 ! ...
2
votes
4answers
2k views

Web server address with two ISPs

I am new to networking and I have the following problem. In the small company I work in we have a load balance router with two ISPs (only one ISP is connected at the moment) and to the router there is ...
2
votes
1answer
687 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
votes
1answer
169 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 ...
2
votes
1answer
452 views

Cisco ASA failover monitor-interface policy

I have Cisco ASA 5585 and it has 10G interface in port channel where i configured multiple vlan sub-interface, is it worth to monitor every single sub-interface for failover policy or just monitor ...
2
votes
1answer
237 views

NAT and two internet providers, how to configure failover

Will you please help me to setup ISP2 as a failover internet provider. Configuration as follows: ip source-route ! ip cef ! no ip domain lookup no ipv6 cef ! multilink bundle-name authenticated ! ...
2
votes
1answer
44 views

one uplink, two routers for redundancy

Let's say i have two linux boxes, RouterA and RouterB, both with two NICs (eth0 and eth1). RouterA/eth0 is connected to an internet uplink. RouterA/eth1 and RouterB/eth1 are directly connected. What ...
2
votes
1answer
1k views

IP SLA command not available, alternatives?

I have a Cisco router with two ISPs connected to it, and I wanted to configure a failover between them using an IP SLA, track for the IP SLA and two static routes (when the first route fails, the ...
2
votes
1answer
425 views

Layer 2 Failover

How can I setup a layer2 failover configuration? My Network setup: The distance between Site A and Site B is 2 km. Both sites are connected via a wireless link. As a backup line, we also have a ...
2
votes
2answers
989 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 ...
2
votes
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. ...