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Questions[hsrp](server)

Martin Hope
Kashif Minhas
Asked: 2020-02-09 05:57:09 +0800 CST
  • 3

I'm configuring HSRP having scenario described in figure below. One gateway is active for one network and standby for other network and vice versa for other gateway. DHCP is configured on both Gateways and clients get automatic IPs. My question is if one Gateway (Switch A) is down other Gateway (Switch B) automatically becomes active for network for whome it is standby. Which DHCP option we need to configure on both Gateways DHCPs so that when Switch B is active and Switch a is down, and another client plugs in to network for which Switch A is active how come Switch B knows which IPs are allready assigned by Switch A and Switch B assign IPs to new clients other than IPs previously assigned by Switch A.

dhcp-option vrrp hsrp
Martin Hope
Arenstar
Asked: 2012-03-22 04:12:15 +0800 CST
  • 3

I currently have planned

2 x uplinks (HSRP Active/Standby)
2 x pfsense firewalls (Carp Enabled)
2 x layer2 switches

Please criticize or offer help on the correct way to do this. I have a feeling im missing a valid point of simple networking.

The firewalls bridge the links EXT to INT, and the INT links are using LAGG for redundancy

firewall redundancy pfsense carp hsrp
Martin Hope
Lairsdragon
Asked: 2011-03-31 02:07:56 +0800 CST
  • 4

I'm just struggling with a IPv4/IPv6 Dual Stack Setup for our new hosting environment. As central routers/switches I've got two Cisco Catalyst 3750G-48TS. The switches are not stacked, for IPv4 they are identically configured for routing and HSRP for redundancy on the first hop.

For Ipv6 I've tried to use the same configuration with routing and HSRP, but I had to learn that the Cisco switches are only able to do HSRP for IPv4 or IPv6

Now I am trying to find a working setup for IPv6 with the given equipment and I've got a couple questions:

  • IPv6 does Router advertisements and the network devices are learning these routers. How fast does the network devices mitigate a outage of a router?

  • Given that the IPv6 RA is distributing the routers, what does HSRP good to a IPv6 network?

cheerio Steve

ipv6 hsrp
Martin Hope
Kyle Brandt
Asked: 2010-02-05 08:31:42 +0800 CST
  • 4

Looking for help filling in how redundancy in the following model might work:

alt text http://www.kbrandt.com/files/NetworkSample.jpg

I believe my Datacenter will give me redundant gateways with two hand offs (going to have to talk to the more about this). Router A would be a 3825, and Router B would a 2811. The switches are Power Connect 5424s. The Web Server would have one public IP address (12.12.12.12) so no round robin DNS or anything like that. The routers would handle the NAT mapping of 12.12.12.12 10.10.0.5.

I am trying to understand how both the Layer 2 and Layer 3 setup might work:

  • Would both links coming from the ISP be able to provide the same block range (If I had webservers 12.12.12.12 12.12.12.13 12.12.12.14 etc)?
  • Would I have to set up NIC teaming on the webserver, plug each NIC into each switch, and then each switch to the router, without or without the switches connected to each other?
  • If the datacenter gives me two HSRP handoffs, my routers see a virtual address so no special configuration on that side of the router? But, the LAN side of the router would I set up HSRP?
  • If the switches are independent like in the diagram, and NIC were to fail in web server, and it was the one connected to the currently active router, that server would go down?

I am getting bits of pieces from googling, but am have trouble seeing the big picture of how a setup like this all fits together. If it isn't clear, this sort of network redundancy new to me :-)

Updated information: (Will use this section to add information requested or stuff I think of)
The gateway of each client (webserver) would would be the local IP of the router. There will actually be a few different internal networks attached to my routers. Each of these internal networks will get its own hand off from each router, and its own pair of switches. So I guess HSRP would be set up on the LAN side for each network. My routers also act as the firewalls. The routers are also endpoints for a separate MPLS network and VPN tunnels.

networking cisco redundancy hsrp