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gw66
Anon
2013-Oct-9 1:44 pm
[HELP] classificationhey guys i'm finally getting back to this project and just had a question
i have r1 & r2 both setup and using say 1.1.1.1 as vip for hsrp . both routers are going to two different pops. both routers are also setup with ibgp . I have two questions ..
for hsrp hw redundancy: .if i loose r1 ( primary( priortiy 110 ) r2 ( priority 50 )picks up traffic but what path does it take after it leaves the gw of r2 ?
for isp line loose. Does r1 stay the primary and just forwards traffic over to r2 via ibgp then out the gw of r2?
Also how would i test both scenerios to ensure it works? I would think for hsrp just unplug r2 , but how would i test if the isp line went down ? |
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TomS_Git-r-done MVM join:2002-07-19 London, UK |
TomS_
MVM
2013-Oct-9 5:15 pm
Thought I covered this in my last post. :-P
Depends how iBGP is set up. You might like to take another look at the things I said about localpref.
Depending on which router has the more favourable localpref, traffic will route that way.
If you lose the router, then traffic has no option but to go via the other router. If you lose an ISP link then traffic should automatically start routing over to the other link, so long as you were also using eBGP to your ISP. Traffic will still route in to your primary HSRP router as long as it is up and running. HSRP only provides gateway protection, it doesnt care about anything else that happens on the router.
You can test it by simply unplugging the cable for the ISP line, causing the interface to go down. Or shut the interface. Or shut the eBGP session. Either way you should get the same result. |
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gw66
Anon
2013-Oct-9 5:35 pm
OK, i was thinking to deep into it. thanks.
so if i unplugged the isp line on r1 outbound traffic will still use r1 the primary in my hsrp setup (because the hardware was not at fault ?)but still isp link one is down so( like you said) it has no choice but to route to r2 and out it's gw?
do i have that right. Sorry for sounded like a broken record.
I dont want to start with favourable localpref just yet. 1 step at a t time with me. i'm slow:) but as you can see i like to understand things in full before i move on.
thanks TomS_ |
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TomS_Git-r-done MVM join:2002-07-19 London, UK |
TomS_
MVM
2013-Oct-9 5:41 pm
Yes that is correct.
localpref probably only really matters if r2 took over as the HSRP active router and the ISP connection on r1 was still operational. In that case, localpref would work to ensure that traffic still exited your network via r1.
Otherwise you might find that each router prefers the routes it receives directly via eBGP. Without a localpref tweak, any traffic that comes in to r2 will simply route out of r2's ISP connection, and likewise r1 will route traffic out via its ISP connection.
localpref is a method of traffic engineering to make the network work the way you want, rather than how it would otherwise figure it out itself. |
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gw66
Anon
2013-Oct-9 5:51 pm
cool that's what i figured, and maybe when i get this working i'll play around with that and have my ipsec traffic take one path and web traffic take another. Next week i should have my config setup. thanks again!! |
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TomS_Git-r-done MVM join:2002-07-19 London, UK |
TomS_
MVM
2013-Oct-9 5:53 pm
Thats going to be more of a policy routing thing than BGP. |
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gw66
Anon
2013-Oct-16 9:14 pm
Ok so i finally was able to work on my config today and this is what i got. I shows bgp is up but i don't see it in my sh ip route. below are both configs TomS_
How can i even test this to ensure it works before i go live? I already tested my hsrp config and that works perfect. thanks for you time
r2 config
loopback 0 ip address 10.18.3.2 255.255.255.255 ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 description O - [100MB] ISP-PATH2 ip address 1.1.1.1 255.255.255.252 load-interval 30 duplex auto speed auto ! interface GigabitEthernet0/1 no ip address duplex auto speed auto ! interface GigabitEthernet0/1.1 description [LAN] Hand Off - HSRP Interface encapsulation dot1Q 1 native ip address 2.2.2.2 255.255.255.224 standby 0 ip 2.2.2.1 standby 0 priority 85 standby 0 preempt standby 0 authentication 1234 standby 0 track 1 decrement 40 ! interface GigabitEthernet0/1.2 description ISP Service 2 encapsulation dot1Q 2 ip address 3.3.3.3 255.255.255.248 ! router bgp 64611 bgp router-id 10.18.3.2 bgp log-neighbor-changes neighbor IBGP peer-group neighbor IBGP remote-as 64611 neighbor IBGP password 7 @@@@@ neighbor IBGP update-source Loopback0 neighbor 10.18.3.1 peer-group IBGP ! ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 6.6.6.6 ip route 10.18.3.1 255.255.255.255 3.3.3.3
R1 config loopback 0 ip address 10.18.3.1 255.255.255.255 ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 description OMSC - [89MB]-Circuit # 01ghkg ip address 4.4.4.4 255.255.255.252 load-interval 30 duplex auto speed auto ! interface GigabitEthernet0/1 no ip address duplex auto speed auto ! interface GigabitEthernet0/1.1 description [LAN] Hand Off -HSRP interface encapsulation dot1Q 1 native ip address 2.2.2.4 255.255.255.224 standby 0 ip 2.2.2.1 standby 0 priority 110 standby 0 preempt standby 0 authentication 1234 standby 0 track 1 decrement 40 ! interface GigabitEthernet0/1.2 description ISP Service 2 encapsulation dot1Q 2 ip address 3.3.3.4 255.255.255.248 ! router bgp 64611 bgp router-id 10.18.3.1 bgp log-neighbor-changes neighbor IBGP peer-group neighbor IBGP remote-as 64611 neighbor IBGP password 7 $$$$$ neighbor IBGP update-source Loopback0 neighbor 10.18.3.2 peer-group IBGP
ip route 0.0.0.0 0.0.0.0 7.7.7.7 ip route 10.18.3.2 255.255.255.255 3.3.3.4
r2 bgp summary
#sh ip bgp summary BGP router identifier 10.18.3.1, local AS number 64611 BGP table version is 5, main routing table version 5
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.18.3.2 4 64611 51 50 5 0 0 00:42:46 0
r1 bgp summary
sh ip bgp summary BGP router identifier 10.18.3.2, local AS number 64611 BGP table version is 3, main routing table version 3
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.18.3.1 4 64611 52 53 3 0 0 00:44:31 0
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TomS_Git-r-done MVM join:2002-07-19 London, UK |
TomS_
MVM
2013-Oct-18 7:41 am
What is it that you arent seeing in your routing table?
Could you perhaps attach the full configs in text files rather than a cut down version. |
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