10-08-2017 03:51 PM - edited 03-05-2019 09:16 AM
Hello,
What's the best way to create redundency when there are two ASR1002 chassis? Single ISP link with WAN/Internet connection at this time. So, the question really is what's the best way to configure two ASRs when there's a single ISP link and when there's two active/active WAN/Internet circuts/links?
Thanks in advance.
~zK
10-08-2017 04:50 PM
Hello,
To achieve full redundancy between the two ASRs is mainly to have two internet connections then configure an IP SLA pinging a known IP address such as 8.8.8.8 or 8.8.4.4
Then you want to configure HSRP, VRRP, or GLBP...
For HSRP it goes:
standby (group number between 0 and 255) ip (ip address of default gateway within subnet)
standby (group number) preempt delay minimum 10 (for a minimum of 10 seconds down time, or fine tune it to suit how long you expect to be down)
standby (group number) track 1
Someone else can fill in the commands for VRRP and GLBP.
10-08-2017 04:51 PM
You can't have redundancy with one internet circuit... I have tried.
10-09-2017 05:47 AM
10-26-2017 04:38 PM
So, there is no redundancy or fail-over mechanism to enable or create so when one of the ASRs fails the standby takes over, correct?
We do have two active/active Internet/WAN links from the same ISP. Each link is connected directly to an ASR( ISP --- ASR1 & ISP ---- ASR2). Each ASR is connected to a different downstream switch, which aren't configured with FHRP. Each switch is connected to an ASA, which are configured with fail-over. The topology simply looks something like this:
ISP
|
/\
/\
ASR1 ASR2 -- No physical connection between the two ASRs
| |
SW1 -- SW2 -- Switches are physically connected. 802.1q. No FHRP
| |
ASA1 -- ASA2 -- ASAs are physically connected and configured for FO
| |
SW1 -- SW2 -- Switches are physically connected. 802.1q. HSRP configured
I am tasked to redesign this topology so it can provide best redundancy solution. Any ideas?
Thanks.
10-27-2017 05:06 AM
11-02-2017 02:13 PM
Thanks for the info.
The ISP is providing us with two Ethernet links. Each link is connected to a different ASR1002 and we have FHRP configured but no SLA, which I am working on. I think the ISP has the two Ethernet hand-offs terminate into a switch on their end so that's how we have HSRP configured on the two ASRs. By the way, I inherited this network just a month ago so I don't have all the info.
So, it seems that the current redundancy/HA solution is adequate except for the fact that the two Internet links are provisioned by the same ISP. Thoughts?
11-02-2017 02:18 PM - edited 11-02-2017 02:19 PM
Going back to my original question. I was thinking of an Inter-chassis redundancy and came across this link: https://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/sbcu/2_xe/sbcu_2_xe_book/sbc_interHA.pdf
11-03-2017 05:51 AM
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