BGP/old setup
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== Diagram == | == Diagram == | ||
[[Image:Wikimedia-core.png]] | [[Image:Wikimedia-core.png]] | ||
| + | |||
| + | == HSRP == | ||
| + | In order to have ''first hop failover'', i.e. failover of the default gateway of all hosts in the network, [http://en.wikipedia.org/wiki/HSRP HSRP] has been implemented on VLAN 1 and 2 on both routers, [[csw1-pmtpa]] and [[csw2-pmtpa]]. Both routers share a "virtual IP", the gateway IP that has been configured on all hosts. One of both routers is active for the IP, the other is in standby, taking over within seconds when the active router fails. Besides the virtual IP, each router has its own unique IP in the respective subnet. | ||
| + | |||
| + | VLAN 1 makes use of HSRP group 1, VLAN 2 uses HSRP group 2. In both cases [[csw1-pmtpa]] has the highest priority and is therefore the default router, but ''preemption'' is disabled, so the default router won't force itself to be the active router once it comes back up. | ||
| + | |||
| + | === Configuration [[csw1-pmtpa]] === | ||
| + | The relevant configuration bits are: | ||
| + | interface Vlan1 | ||
| + | description Public VLAN / interface | ||
| + | ip address 207.142.131.240 255.255.255.192 | ||
| + | standby 1 ip 207.142.131.193 | ||
| + | standby 1 priority 150 | ||
| + | end | ||
| + | |||
| + | interface Vlan2 | ||
| + | description Private VLAN: Apache | ||
| + | ip address 10.0.0.201 255.255.0.0 | ||
| + | standby 2 ip 10.0.0.200 | ||
| + | standby 2 priority 150 | ||
| + | end | ||
| + | |||
| + | === Configuration [[csw4-pmtpa]] === | ||
| + | The relevant configuration bits are: | ||
| + | interface Vlan1 | ||
| + | description Public VLAN | ||
| + | ip address 207.142.131.244 255.255.255.192 | ||
| + | standby 1 ip 207.142.131.193 | ||
| + | end | ||
| + | |||
| + | interface Vlan2 | ||
| + | description Private VLAN | ||
| + | ip address 10.0.0.202 255.255.0.0 | ||
| + | standby 2 ip 10.0.0.200 | ||
| + | end | ||
| + | |||
| + | == External links == | ||
| + | * [http://www.cisco.com/en/US/products/hw/switches/ps5528/products_configuration_guide_chapter09186a00803a9a27.html#wp1061629 Configuring HSRP on Cisco 3560] | ||
[[Category:Network]] | [[Category:Network]] | ||
Revision as of 22:19, 4 May 2006
The pmtpa cluster has L3 failover using two separate core routers, and 2 BGP links to upstream.
Contents |
Diagram
HSRP
In order to have first hop failover, i.e. failover of the default gateway of all hosts in the network, HSRP has been implemented on VLAN 1 and 2 on both routers, csw1-pmtpa and csw2-pmtpa. Both routers share a "virtual IP", the gateway IP that has been configured on all hosts. One of both routers is active for the IP, the other is in standby, taking over within seconds when the active router fails. Besides the virtual IP, each router has its own unique IP in the respective subnet.
VLAN 1 makes use of HSRP group 1, VLAN 2 uses HSRP group 2. In both cases csw1-pmtpa has the highest priority and is therefore the default router, but preemption is disabled, so the default router won't force itself to be the active router once it comes back up.
Configuration csw1-pmtpa
The relevant configuration bits are:
interface Vlan1 description Public VLAN / interface ip address 207.142.131.240 255.255.255.192 standby 1 ip 207.142.131.193 standby 1 priority 150 end
interface Vlan2 description Private VLAN: Apache ip address 10.0.0.201 255.255.0.0 standby 2 ip 10.0.0.200 standby 2 priority 150 end
Configuration csw4-pmtpa
The relevant configuration bits are:
interface Vlan1 description Public VLAN ip address 207.142.131.244 255.255.255.192 standby 1 ip 207.142.131.193 end
interface Vlan2 description Private VLAN ip address 10.0.0.202 255.255.0.0 standby 2 ip 10.0.0.200 end
