HSRP track interface (ASR9k v4.2.3)
Hi all,
I was trying to configure the track interface command within hsrp, and when I apply the command the priority group decrement immediately.
Before of apply the configuration:
RP/0/RSP0/CPU0:PE1-ASR9010-LAB-MACUL#sh hsrp bvi 600
Thu Sep 12 14:04:07.548 UTC
P indicates configured to preempt.
|
Interface Grp Pri P State Active addr Standby addr Group addr
BV600 1 110 P Active local 200.10.10.3 200.10.10.1
Then, I apply track interface:
router hsrp
interface BVI600
address-family ipv4
hsrp 1 version 1
timers 1 3
preempt
priority 110
address 200.10.10.1
track GigabitEthernet0/3/0/26 20
And priority decrement:
RP/0/RSP0/CPU0:PE1-ASR9010-LAB-MACUL#sh hsrp bvi 600
Thu Sep 12 14:05:20.302 UTC
P indicates configured to preempt.
|
Interface Grp Pri P State Active addr Standby addr Group addr
BV600 1 90 P Standby 200.10.10.3 local 200.10.10.1
Why priority decrement if the interface is always up?
Regards.
No. That´s why I am asking why the priority decrement if the interface is always UP.
Look:
RP/0/RSP0/CPU0:PE1-ASR9010-LAB-MACUL#sh inter gi 0/3/0/26
Fri Sep 13 10:41:55.907 UTC
GigabitEthernet0/3/0/26 is up, line protocol is up
Without track command:
RP/0/RSP0/CPU0:PE1-ASR9010-LAB-MACUL#sh hsrp bvi 600
Fri Sep 13 10:42:30.411 UTC
P indicates configured to preempt.
|
Interface Grp Pri P State Active addr Standby addr Group addr
BV600 1 110 P Active local 200.10.10.3 200.10.10.1
After I apply track command:
router hsrp
interface BVI600
address-family ipv4
hsrp 1 version 1
timers 1 3
preempt
priority 110
address 200.10.10.1
track GigabitEthernet0/3/0/26 20
RP/0/RSP0/CPU0:PE1-ASR9010-LAB-MACUL#sh inter gi 0/3/0/26
Fri Sep 13 10:44:28.498 UTC
GigabitEthernet0/3/0/26 is up, line protocol is up
RP/0/RSP0/CPU0:PE1-ASR9010-LAB-MACUL#sh hsrp bvi 600
Fri Sep 13 10:44:43.139 UTC
P indicates configured to preempt.
|
Interface Grp Pri P State Active addr Standby addr Group addr
BV600 1 90 P Standby 200.10.10.3 local 200.10.10.1
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Question: ACE FT Track Interface
Hi all,
I have two ACE appliances installed with HA configuration. I have 5 vlans (Vlan1, Vlan2, Vlan3, Vlan4 and Vlan5) come from 1 trunk interface. I have 1 ADMIN context and 1 PRODUCTION context. I have configured FT Interface, FT Group and FT Peer in ADMIN context only. I have allocate Vlan1 in ADMIN Context only and assign VLAN2, VLAN3, VLAN4 and VLAN5 for PRODUCTION context. The L3 Interface of VLAN2, VLAN3, VLAN4 and VLAN5 are all configured in PRODUCTION context.
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Appreciate who can help me on this question. ThanksThe FT group can't be configured in a non-Admin context.
switch/User2(config)# ft gr?
% invalid command
All FT groups MUST be configued in Admin and allocated in Admin to a context.
ft group 112
peer 1
peer priority 90
associate-context User2
inservice
switch/Admin#
The only FT commands inside a context are :
switch/User2(config)# ft ?
auto-sync Enable auto sync
track Configure Fault Tolerance tracking for switchover
switch/User2(config)# ft
And, yes, if tracking configured in a context will reduce priority to its associated group configured in Admin.
Gilles. -
HSRP both become active once tracked interface goes down
Hi team,
I was doing a fail-over testing for several sites for a customer.(dual CE router setup)
I have two routers 08R & 09R with following HSRP config.
with this configuration 08R is active & 09R is secondary.. all good
but when I shutdown the Serial link on active router(08R). both become active and standby unknown
they can ping each other, checked ARP table, all good.
also removed track statement on backup router (09R) but no joy...
put the debug on
Please advise.
08R#sh run int f0/0
ip address 10.58.0.29 255.255.255.0
standby 1 ip 10.58.0.30 <---hsrp ip
standby 1 priority 105<------------------- when s0/0/0 down, becomes 95
standby 1 preempt
standby 1 track Serial0/0/0.100
09R#sh run int f0/0
ip address 10.58.0.31 255.255.255.0
standby 1 ip 10.58.0.30
standby 1 priority 101 <-------
standby 1 preempt
standby 1 track Serial0/1/0:0.100<-----------also tracking its own serial interface (removed this as its not required but still not working)
Debug on 08R
Jun 25 08:51:33.554 GMT: HSRP: Fa0/0 Grp 1 Hello out 10.58.0.29 Active pri 95 vIP 10.58.0.30 <---sending hellos with lower priority 95, no in pkts
Jun 25 08:51:36.554 GMT: HSRP: Fa0/0 Grp 1 Hello out 10.58.0.29 Active pri 95 vIP 10.58.0.30
Jun 25 08:51:37.978 GMT: HSRP: Fa0/0 Grp 1 Hello out 10.58.0.29 Active pri 95 vIP 10.58.0.30
Debug on 09R
Jun 25 08:52:00.542 GMT: HSRP: Fa0/0 Grp 1 Hello out 10.58.0.31 Active pri 101 vIP 10.58.0.30
Jun 25 08:52:00.542 GMT: HSRP: Fa0/0 Grp 1 Hello in 10.58.0.29 Active pri 95 vIP 10.58.0.30
Jun 25 08:52:00.542 GMT: HSRP: Fa0/0 Grp 1 Coup out 10.58.0.31 Active pri 101 vIP 10.58.0.30
Jun 25 08:52:00.542 GMT: HSRP: Fa0/0 Grp 1 Hello out 10.58.0.31 Active pri 101 vIP 10.58.0.30
Jun 25 08:52:03.542 GMT: HSRP: Fa0/0 Grp 1 Hello out 10.58.0.31 Active pri 101 vIP 10.58.0.30
Jun 25 08:52:03.542 GMT: HSRP: Fa0/0 Grp 1 Hello in 10.58.0.29 Active pri 95 vIP 10.58.0.30
Jun 25 08:52:03.542 GMT: HSRP: Fa0/0 Grp 1 Coup out 10.58.0.31 Active pri 101 vIP 10.58.0.30
Jun 25 08:52:03.542 GMT: HSRP: Fa0/0 Grp 1 Hello out 10.58.0.31 Active pri 101 vIP 10.58.0.30Try this:
Router 08R Configuration
track 100 interface Serial0/0/0.100 ip routing
interface FastEthernet0/0
ip address 10.58.0.29 255.255.255.0
standby 1 ip 10.58.0.30
standby 1 preempt
standby 1 priority 105
standby 1 track 100 decrement 10
Router 09R Configuration
track 100 interface Serial0/1/0:0.100 ip routing
interface FastEthernet0/0
ip address 10.58.0.31 255.255.255.0
standby 1 ip 10.58.0.30
standby 1 preempt
standby 1 priority 101
standby 1 track 100 decrement 10
Ref.: CCO
/André -
hallo , i have a question if my configuration for dual HSRP is correct, and if the HSRP failover works with nat
thank you
ROUTER 1
========
track 10 interface GigabitEthernet0/1 line-protocol
track 20 interface GigabitEthernet0/0 line-protocol
interface GigabitEthernet0/0
ip address 172.16.1.11 255.255.0.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
standby 10 ip 172.16.1.10
standby 10 priority 110
standby 10 preempt
standby 10 authentication
standby 10 track 10 decrement 20
interface GigabitEthernet0/1
ip address 87.248.47.37 255.255.255.224
ip access-group 116 in
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
standby 20 ip 87.248.47.36
standby 20 priority 110
standby 20 preempt
standby 20 authentication
standby 20 track 20 decrement 20
ROUTER 2
========
track 10 interface GigabitEthernet0/1 line-protocol
track 20 interface GigabitEthernet0/0 line-protocol
interface GigabitEthernet0/0
ip address 172.16.1.12 255.255.0.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
standby 10 ip 172.16.1.10
standby 10 priority 95
standby 10 preempt
standby 10 authentication
standby 10 track 10 decrement 20
interface GigabitEthernet0/1
ip address 87.248.47.38 255.255.255.224
ip access-group 116 in
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
standby 20 ip 87.248.47.36
standby 20 priority 95
standby 20 preempt
standby 20 authentication
standby 20 track 20 decrement 20
FOR ANY ROUTER
==============
ip forward-protocol nd
ip nat pool xxx
ip nat inside source list 56 pool .... overload
ip nat inside source static a.a.a.a b.b.b.b
ip route x.x.x.x 255.255.252.0 87.248.47.xx
ip route y.y.y.y 255.255.255.255 87.248.47.xx
access-list 56 permit any
access-list 116 permit tcp host ..............
access-list 116 permit ......................
access-list 116 deny ip any anyI do not see anything that is "incorrect" in the syntax of this config for HSRP. I will comment that you may not get the results that you expect if you track the line protocol of the GigEthernet interfaces, especially on the LAN side. Since the router connections are through a switch it is quite possible that you will lose the ability to communicate between HSRP peers but that the interface line protocol will stay up on the active router. I will also question if the connections on G0/1 are really through a router how you will get both interfaces into the same subnet. It is not an issue on router 1 or router 2 but how does the other router have 2 routed ports in the same subnet?
I am slightly confused about your second question. You seem to be asking does HSRP work when you are running NAT. I can not think of anything about NAT that would impact HSRP failover. But if your question is really about whether running NAT is impacted when you run HSRP then I believe that the answer is that if traffic has been running through router 1 and a set of translations have been built on router 1 and then you failover to router 2 then there will not be the same set of translations on that router. So there would be some impact on traffic in that case.
HTH
Rick -
HSRP Interface Tracking Question
I have a pair of 7206 routers for Internet access. The Internet was provided over OC3, and used interface POS1/0. I just upgraded the Internet to Ethernet so now the interface is GigabitEthernet 0/3.
I just discovered that there there is another interface that uses POS1/0 as an HSRP tracking interface. So my question is: Can I just remove the old tracking interface and add the new one? Or is there another prefered method to do this?
My current HSRP interface:
interface GigabitEthernet0/1.21
description INET
encapsulation dot1Q 21
ip address x.x.x.x 255.255.255.240
ip broadcast-address x.x.x.x
no ip redirects
ip accounting output-packets
ip flow ingress
ip nbar protocol-discovery
no snmp trap link-status
standby 1 ip x.x.x.x
standby 1 priority 105
standby 1 preempt
standby 1 track POS1/0
Thanks!
RayRay
While it is correct that you can just change the HRP interface to track the Ethernet interface be aware that it may not work quite the same way. With POS and most serial interface implementations if communications with the peer is lost then the loss of keepalives will change the interface state to line protocol down and that is what the interface tracking is looking for. However with an Ethernet interface if you lose communication with the peer the interface may still be in a line protocol up state. In that circumstance interface tracking will not detect the problem.
HTH
Rick -
HSRP / interface tracking and not only
Hi All,
HSRP provides nice feature of tracking an external interface, while taking decision with regard to active HSRP router election.
What I would like to ask you is as follows:
In my network all routing decisions are based on Layer2 protocol (NSAP addresses in ATM). On a top of this, I have pure IP network without any dynamic routing protocol (neither OSPF nor BGP is not supported on ATM boxes). Now I would like to bring ATM interface down for a gateway, which does not work as an active HSRP router.
As I mentioned before Layer2 takes a decision for traffic a traffic flow. Im afraid under certain circumstances traffic may hit ATM interface attached the standby router. So what next? Wont be properly routed via HSRP pair. Is my understanding correct?
I would like to have activated only one ATM interface running on active HSRP router, on the standby line protocol should be down. When HSRP re-election process takes place, newly activated router becomes active and in the first order changes protocol line to active. Is that possible?
Just as a last remark, ATM interfaces are monitored (tracked) only. Standby group is configured on Ethernet ports.
Regards,
ArturHello Artur,
HSRP 'tracking' feature is solely to take down the 'HSRP STATUS' to up or down and it has no bearing on the actual line protocol state of the interface.
So if you desire that HSRP should bring down the ATM interface, then that is not possible. HSRP tracking would only change the 'priority' of that interface and not bring it down/up.
Let me know if i understood and answered your question correctly, -
HSRP Interface Tracking on ATM Sub-Interface?
I want to enable HSRP interface tracking to monitor an ATM sub-interface. As I understand it, when using the (standby 1 track <interface>) command, the HSRP group priority will be decremented only if the line protocol goes down on the interface being tracked. For this reason I need to track an ATM sub-interface (i.e. atm1/0.77). I am wondering if this will work properly. Has anyone ever used this configuration successfully?
Hi Friend,
I find no reason why it should not work?
When it work for serial subinterface and frame relay interfces it should also work for atm subinterface.
I have implemented in serial subinterface.
Yes it should work fine. Go ahead and implement and update the status.
Regards,
Ankur -
Nexus 5548UP - HSRP and vPC, tracking required?
Hi,
We've got two Nexus 5548UPs that are vPC and HSRP peers.
I've had some feedback that I should incorporate the tracking function to close the vPC down in the case of a layer 3 problem, the thing is I'm not sure it's required. I can see in this article it recommends implementing tracking when your L2 peer-link and L3 interfaces are on the same module (which it is in my case).. http://www.cisco.com/en/US/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf
But in this article it says not to use tracking.. http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/design_guide_c07-625857.pdf
Any one got any real world experience and can offer some feedback.. I don't mind putting it in just want to understand why.
Thanks,
Nick.Hi Nick
there is two tracking can be use din nexus enviroment
HSRP tracking and vPC tracking
for using one line card for the vPC peer link vPC tracking is recomnded
HSRP tracking is used to track L3 uplinks to the core
Using vPC with HSRP/VRRP object tracking may leads to traffic blackholing in case object tracking is triggered
its better to use separate L3 inter switch link instead of using HSRP tracking
hope this help -
Hello,
Just a few questions on a HA lab to track the user interface. If i configure the primary ACE in the admin-context like this:
ft interface vlan 402 ---->>> FT VLAN
ip address <primary_ip>
peer ip address <secondary_ip>
no shutdown
ft peer 1
heartbeat interval 300
heartbeat count 10
ft-interface vlan 402
ft group 4 --->> group associated to user-context Juniper
peer 1
priority 200 --->>> primary is 200 and secondary is 100
associate-context Juniper
inservice
and in the user-context of the primary ACE:
ft track interface vlan202 ---->>> VLAN 202 is where VIPs are configured in the Juniper user-context
track-interface vlan 202
peer track-interface vlan 202
priority 110
peer priority 100
1.- the command "peer-track interface" is useful in case the primary ACE and secondary ACE are not connected on vlan 202 via the same single switch? i guess without this command the secondary wouldnt track the user interface 202.
2.- Do i need to specify "peer priority 100" in the user context for the secondary ACE? Is it used to set the priority of the secondary once the primary becomes standby? Default is 100 for secondary so i think its not useful.
3.- Can i configure preempt delay in ACE?
Thanks,
Giulio.Hi Giulio
Could you please check 'ft group 4' configuration on your standby ACE?
Probably, you configure 'priority 105' on standby too. If so, please change configuration
from 'priority 105' to 'peer priority 105' on standby ACE.
# active admin context
ft group 4
peer 1
priority 105
associate-context Juniper
inservice
# standby admin context
ft group 4
peer 1
peer priority 105 <<==
associate-context Juniper
inservice
I checked your configuration and found you configured ft group for Juniper context only.
This means Admin context is not sync'ed. (I was misled into thinking that your admin
context is also sync'ed.)
If ft group for admin context is configured, you configure 'priority 105' on active admin context
only since 'priority 105' configuration is automatically converted to 'peer priority 105' and set
to standby ACE.
However, if ft group for admin context is not configured, your should configure both active and
standby ACE manually. Furthermore, you have to convert them by hand.
Since admin context of my ACE appliance is synced as below, I only configured 'ft group 4'
on active ACE. (Standby ACE was automatically set 'peer priority 105'.)
This behavior is same with module and appliance.
# my ace appliance configuration
ACE4710a/Admin# sh run ft | b group
Generating configuration....
ft group 1
peer 1
priority 105
associate-context Admin
inservice
ft group 4
peer 1
priority 105
associate-context test
inservice
ACE4710a/Admin# sh ft gr sum
FT Group : 1
Configured Status : in-service
Maintenance mode : MAINT_MODE_OFF
My State : FSM_FT_STATE_ACTIVE
My Config Priority : 105
My Net Priority : 105
My Preempt : Enabled
Peer State : FSM_FT_STATE_STANDBY_HOT
Peer Config Priority : 100
Peer Net Priority : 100
Peer Preempt : Enabled
Peer Id : 1
No. of Contexts : 1
FT Group : 4
Configured Status : in-service
Maintenance mode : MAINT_MODE_OFF
My State : FSM_FT_STATE_ACTIVE
My Config Priority : 105
My Net Priority : 105
My Preempt : Enabled
Peer State : FSM_FT_STATE_STANDBY_HOT
Peer Config Priority : 100
Peer Net Priority : 100
Peer Preempt : Enabled
Peer Id : 1
No. of Contexts : 1
ACE4710a/Admin#
Regards,
Yuji -
Hi,
I have implemented HSRP betwen Cisco 1841 & Cisco 1700. and used Standby Track command.
1841>
interface FastEthernet0/0
ip address 10.4.0.2 255.255.252.0
duplex auto
speed auto
standby 1 ip 10.4.0.1
standby 1 priority 254
standby 1 preempt
standby 1 track Serial0/0/0 100
1751>
interface FastEthernet0/0
ip address 10.4.0.3 255.255.252.0
duplex auto
speed auto
standby 1 ip 10.4.0.1
standby 1 priority 250
The show standby Command on 1841 is as follows:
1841#show standby
FastEthernet0/0 - Group 1
State is Active
4 state changes, last state change 01:49:46
Virtual IP address is 10.4.0.1
Active virtual MAC address is 0000.0c07.ac01
Local virtual MAC address is 0000.0c07.ac01 (v1 default)
Hello time 3 sec, hold time 10 sec
Next hello sent in 0.244 secs
Preemption enabled
Active router is local
Standby router is 10.4.0.3, priority 250 (expires in 8.108 sec)
Priority 154 (configured 254)
Track interface Serial0/0/0 state Down decrement 100
IP redundancy name is "hsrp-Fa0/0-1" (default)
YB-MUMNP-P-1841#
I have made the serial 0/0/0 link down (not by Serial Shutdown command, but by switching off the link)
If you see, the priority of the 1841 router is 154, as compared to 250 of 1751,
Yet 1841 is Active router.
Is there somethin i hv missed, or the router is misbehaving?
rgds
SumedhHi amit,
I was having the same dilemna while preparing for my BCMSN - CCNP exam :) Consider this scenario
Router A with HSRP priority 50 with no preempt configured
Router B with HSRP priority 25 with preempt enabled.
Assume router A is the first HSRP router on the LAN segment it becomes the default active forwarder and begins forwarding data. Now router B comes up and since it has preempt configured, it will preempt router A. However since it has lesser priority it will fail.
Assume router A fails (i.e the hold down timer expires after not recieving 3 consecutive hellos) now router B becomes the default active forwarder.
So far so good.
If router A comes back online, it will start sending hellos, but since it is NOT configured with the preempt command, router A will not set the preempt flag and hence router B will continue being the active forwarder until the time it actually goes down or an administrator manually does the needful.
Now if Router A was configured with standby preempt, Router A would correctly set the preempt flag and since it has higher priority it would correctly be set as the active forwarder once again
Hope I understood your problem correctly and gave the right explanation. -
ACE redundancy tracking and failure detection
Hello,
I have configured redundancy on a pair of ACEs, and looking now for the most approriate method of failure detection.
In the admin guide, 3 possible methodes are explained: host tracking, interface tracking and HSRP group tracking.
I don't have HSRP configured on the Supervisors in the ACEs chassis, the default gateway is on other chassis, so HSRP tracking is not an option.
The ACEs are configured in routed mode.
I have 1 VLAN with all VIPs, and 4 server VLANs.
There are 2 contexts active.
I was thinking of tracking all 5 VLAN interfaces + tracking the default gateway on client side.
Would this be a good approach?
thanks in advance for your input.Hi ,
The ACE supports a maximum of 4,093 VLANs per system and a maximum of 1,024 shared VLANs per system.
Alos note that the ACE supports a maximum of 8,192 interfaces per system that include VLANs, shared VLANs, and BVI interfaces.
Regards,
Sachin -
Hi,
I would need some advise to clarify on the following HSRP preempt concept. Please let me know if the following is correct.
1) both active and standby routers NOT configured with HSRP preempt. When active router goes down, standby will NOT take over due to NO HSRP preempt configured.
2) both active and standby routers configured with HSRP preempt. When active router goes down, standby will take over as the active. When the active goes down again, the standby will take over as active. However, there will be a short downtime during the HSRP transition states. How long is the transition state?
3) only standby router configured with HSRP preempt. When active router goes down, standby will take over to become the active. However, when the active router goes down again, the standby router will NOT take over as the active due to NO HSRP preempt configured.
Thanks
ChristinaChristina
1) Not correct. If both routers do not include preempt and the active router goes down then the standby router WILL take over as the active. Preempt is not an issue here. If the currently active router goes down and if there is a standby then the standby will take over as active. In a failure situation the standby will take over without consideration of preempt.
2) I am not entirely clear what you are describing when you say the active goes down and then when the active goes down again. So let me re-phrase it in terms of rtrA and rtrB. Assume that rtrA has a higher priority and becomes active and rtrB is standby. Then rtrA goes down. rtrB then becomes active. At that point I do not follow your scenario. I am not sure whether you assume that rtrA comes back into service or if you assume that there is rtrC which became standby.
If rtrA comes into service again and it has higher priority and it has preempt then rtrA becomes active and rtrB returns to standby. This is because preempt on rtrA allows it to displace rtrB. There is some very brief period of transition. I am not sure how long but I know it is quite short.
If rtrB became active and there is rtrC who becomes standby and then rtrB fails then rtrC becomes active and there is no period of interruption.
3)I have the same problem with this description. You describe active and standby, you assume that the active fails, and then you assume that the active fails again without specifying whether the original active router came back in service again.
So let me go back to my example of rtrA and rtrB. Assume that rtrA has higher priority and becomes active and does not have preempt. Assume that rtrB has lower priority and does have preempt. Then rtrA goes down. rtrB becomes active. (Note that this really has nothing to do with preempt - rtrB takes over because the active failed.) If rtrA comes into service then it is in the HSRP group and it has higher priority but it does not become active because it does not have preempt.
Preempt really has to do with enabling a router that has higher priority but is not active to displace the current active router. Preempt is a factor when some router attempts to displace the current active router. It is not a factor when the active router fails.
Let me describe another example. Assume rtrA has priority of 105 and rtrB has priority of 100. So rtrA becomes the active router. Then assume that rtrA is tracking interface serial0/0 and the interface goes down. Now rtrA has priority 95 and rtrB has priority 100. Will rtrB become active? With preempt configured it will and without prempt configured it will not.
HTH
Rick -
Existng setup:
SW-Dist1 SW-Dist2
| |
SW1 SW2
ACE 1 --- ACE2
Active
C1
C2
C3
where C1-3 are contexts, all contexts are active in ACE1.
These ACE are modules in 6504 switches.
SW1 and SW2 respectively.
SW1 and SW2 are trunked to Distribution Switches via port channels.
Requirement is to implement failover by tracking uplink port-channel availability.
How to achieve this? Any help is much appreciated.With ACE you have 3 tracking options
you can track host (an ip), track an Interface and an HSRP group.
Tracking interface option is applicable for VLAN interfaces only. It cannot track port channel/ physical interface.
In your case the best option would be to track HSRP group configured on the uplink devices.
More details at
http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/ace/v3.00_A2/configuration/administration/guide/redundcy.html#wp1024578
Syed Iftekhar Ahmed
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