5
votes
Accepted
Is it bad practice to use a Virtual Router for NTP-Clustering?
I can see a few ways of doing this:
Round robin DNS with multiple A records (as suggested in comments by JFL). This would require the clients to properly re-look up the addresses when required, and ...
- 16.4k
5
votes
Accepted
Breaking a stack switches (with SVIs as gateway) - using HSRP
You will need HSRP or VRRP for you FHRP if you want redundancy for your gateway. Each switch will need an SVI for each VLAN, and each VLAN will have its own FHRP group. You place the group for a VLAN ...
- 101k
4
votes
Accepted
public ip over private lease line
An IP address is an IP address. Public and Private are artificial labels. What makes an address "private" is a loose agreement that no one will route it over the public internet. However, ...
- 32.6k
3
votes
Accepted
L3 Switch acting both as a router and as a switch for the same packets
I am trying to figure out if an L3 switch is able to act as a switch for himself.
That's a main point of an L3 switch. It switches on L2 and routes between VLANs.
Is it possible to configure somehow ...
- 88.1k
3
votes
Is it possible to make a truly active\active L3 VRRP\HSRP configuration between two Nexus in a vPC
You actually don't have to do anything. VPC paired Nexus work exactly as you want them to.
The prerequisite is that all systems involved (i.e. the servers) are attached to the Nexus over a VPC ...
- 8,876
3
votes
Accepted
Layer 2/3 Ring with VRRP/OSPF
You may not get the results you intend.
Router 2 dies then (mirrored for 3):
Router 1 routes all traffic via Router 3 OSPF ensures Router 4 loses
route to subnet 192.168.1.0/24 Therefore ...
- 68.1k
3
votes
What is VRRP used for?
VRRP is used to create a virtual router that can be made redundant by using two routers in a cluster. One router is active, the other is in standby.
When the active router fails, the virtual router's ...
- 88.1k
3
votes
Accepted
What is VRRP used for?
VRRP, and other FHRPs such as HSRP, allow you to have a default gateway configured on your hosts that does not really exist. One router will take over the virtual router IP and MAC addresses, and if ...
- 101k
3
votes
Accepted
VRRP vs HSRP for load sharing
FHRPs, like VRRP, and HSRP, don't load balance anything; that is not their purpose. The purpose of an FHRP is to give a virtual gateway, which can fail to a different physical router in the case of a ...
- 101k
3
votes
How to prevent IP conflict when using VRRP
I tend to agree with @jonathanjo but otherwise:
It is often forsaken, but VRRP - contrary to Cisco HSRP - does NOT require that the primary address of the interfaces belong to the same network as the ...
- 19.8k
3
votes
Accepted
How to prevent IP conflict when using VRRP
Normal duplicate addressing defences should take care of this particular situation.
Specifically, when the client assigns .2 to some server, which is clashing with .2 already on your second router, ...
- 16.4k
3
votes
Using VRRP instead of XSTP
As @JFL has already pointed out, your failover concept has a problem when one of the switches or one of their interconnects fails - currently there's no L2 redundancy. This is because VRRP makes the ...
- 88.1k
3
votes
Accepted
Using VRRP instead of XSTP
As explained in the question comments, no it is not VRRP or STP, as those features address different needs.
STP is about links, i.e. layer 2, while VRRP is about IP gateways, i.e. layer 3.
In the ...
- 19.8k
2
votes
How to prevent IP conflict when using VRRP
A simplicistic, hand-hewn idea:
Are .2 and .3 (or whichever addresses you plan to use for VRRP later on) free to use today?
Then grab them now, and configure the them as IP alias (or ip address &...
- 8,876
2
votes
Accepted
Does VRRP or HSRP work with 2 different upstream ISPs?
An FRHP (First Hop Redundancy Protocol), like HSRP and VRRP, will present virtual IP and MAC addresses to the LAN, and the LAN hosts can be configured to use the virtual IP address for the LAN gateway....
- 101k
2
votes
Accepted
HSRP vs VRRP interface tracking
Object tracking for any service that uses enhanced object tracking is the same. HSRP, VRRP and GLBP all use enhanced object tracking in the same way.
The original HSRP tracking simply tracked the ...
- 101k
2
votes
Accepted
link redundancy
You could achieve this using ospf between R_A and R_B and give the link 1 lower metric
- 1,733
2
votes
Why does a layer 3 hop use vrrp secondary on nexus 6001
In the case of vPC configurations, both HSRP/VRRP peers will actively route packets when they receive them. It is a special behavior for vPC.
Some information on vPC active/active routing
- 969
2
votes
Accepted
Best way to setup VRRP if a router fails
One thing I noticed is that you are not tracking the links to the firewall, and you have no way configured for VRRP to fail over to the other switch if a link goes down. You will fail over if the ...
- 101k
2
votes
What is the packet format of a IPV6 VRRPv3 packet?
The VRRPv3 packet format is exactly the same for IPv4 and IPv6. The VRRP packet is encapsulated in either IPv4 or IPv6, so the IP header will vary per version, but the rest of the packet is the same.
...
- 101k
2
votes
Who should reset TCP connection after VIP has moved onto another host?
The client keeps sending re-transmits(5-8 of them) to to a secondary
server, and it ignores them.
That would be incorrect. If the failover server does not have a TCP connection with the sending host, ...
- 101k
2
votes
What are the differences between VRRP and HSRP?
HSRP :
1) CISCO Proprietary
2) RFC 2281
3) Multicast group Ip:
224.0.0.2 V1
224.0.0.102 V2
4) Port No. UDP 1985
5) PREEMPT: By default disabled
6) Virtual Mac address: 0000.0c07.acxx
...
2
votes
Migrate from Cisco HSRP gateway to Juniper VRRP Gateway
As per my understanding , you have a pair of Cisco NX Switches acting as HSRP gateway. You want to replace them with Juniper QFX switches which will be running VRRP as it is the IEFT standard protocol....
- 1,162
2
votes
Backup Ubiquiti Router in VRRP on WAN keeps taking over as master
VRRP PDUs use IP protocol 112 as described in RFC 5798 §5.1.1.4.
Are there additional firewall flows I have to setup on either of the routers in order to allow vrrp communication to work (i.e. do I ...
- 5,605
1
vote
Accepted
Juniper MX204 to Juniper EX4300 redundant fiber links with load balancing
LAG aggregates multiple physical links into a single, logical one. It can achieve link-level redundancy and a (possibly limited) increase in link bandwidth.
With very few exceptions, LAG doesn't load ...
- 88.1k
1
vote
Accepted
Migrate from Cisco HSRP gateway to Juniper VRRP Gateway
I think you should simply do the following:
confirm reachability of downstream VMs prior to activity
remove HSRP configuration from Cisco devices
commit VRRP configuration to Juniper devices
wait 60 ...
- 5,605
1
vote
Using VRRP instead of XSTP
No, you can't disable STP in this case. VRRP is on L3, STP is on L2. Your router is a L3 switch, so the switches are connected by bridge ports. Some switches might change the port type (e.g. Comware ...
1
vote
Accepted
VRRP or Carp in Cisco 1900 Series
Yes, Cisco supports VRRP. Cisco maintains many documents regarding this, e.g. First Hop Redundancy Protocols Configuration Guide, Cisco IOS Release 15M&T:
Enabling VRRP
SUMMARY STEPS
...
- 101k
Only top scored, non community-wiki answers of a minimum length are eligible