12-05-2019 05:27 AM - edited 12-05-2019 05:28 AM
Hi guys!
please do consider my topology: map-1.png
And my issue:
On Branch Router's i have output of command:
#sh ip route 0.0.0.0 Routing entry for 0.0.0.0/0, supernet Known via "ospf 10", distance 110, metric 1, candidate default path Tag 10, type extern 2, forward metric 10 Last update from 172.19.74.170 on GigabitEthernet0/0, 4w6d ago Routing Descriptor Blocks: * 172.19.74.170, from 172.19.74.245, 4w6d ago, via GigabitEthernet0/0 Route metric is 1, traffic share count is 1 Route tag 10
My interesting int line: Route tag 10
I didnt find any configurations about tag on Core Router:
router ospf 10 router-id 172.19.74.245 passive-interface default no passive-interface GigabitEthernet0/1.47 no passive-interface GigabitEthernet0/1.75 no passive-interface GigabitEthernet0/1.107 no passive-interface GigabitEthernet0/1.177 no passive-interface GigabitEthernet0/1.666 no passive-interface GigabitEthernet0/1.667 no passive-interface GigabitEthernet0/1.1412 no passive-interface GigabitEthernet0/1.1413 no passive-interface GigabitEthernet0/1.1414 no passive-interface GigabitEthernet0/1.1415 no passive-interface Tunnel0 network 10.100.100.0 0.0.0.255 area 0 network 10.100.101.0 0.0.0.1 area 0 network 10.100.101.2 0.0.0.1 area 0 network 172.16.68.168 0.0.0.7 area 0 network 172.16.124.24 0.0.0.3 area 0 network 172.19.74.168 0.0.0.1 area 0 network 172.19.74.170 0.0.0.1 area 0 network 172.19.74.184 0.0.0.1 area 0 network 172.19.74.224 0.0.0.7 area 0 network 172.19.74.245 0.0.0.0 area 0 network 172.19.74.246 0.0.0.1 area 0 network 172.19.74.248 0.0.0.1 area 0 network 172.19.74.250 0.0.0.1 area 0 network 172.19.74.252 0.0.0.1 area 0 network 172.19.74.254 0.0.0.1 area 0 network 172.19.75.16 0.0.0.1 area 0 network 192.168.4.0 0.0.0.255 area 0 network 192.168.111.0 0.0.0.255 area 0 network 192.168.112.0 0.0.0.255 area 0 default-information originate
But i have static default in direction to my ISP( peer to peer link with him)
ip route 0.0.0.0 0.0.0.0 10.1.1.1
And my question:
Where from my Branch Router did the take in tag 10 on route to 0.0.0.0/0
Solved! Go to Solution.
12-05-2019 01:29 PM - edited 12-05-2019 01:35 PM
Hi Ivan,
tag tag-value | (Optional) 32-bit dotted-decimal value attached to each external route. This is not used by the OSPF protocol itself. It may be used to communicate information between autonomous system boundary routers (ASBRs). If a tag is not specified, then the configured OSPF process number is used.
you can find above reference under IOS XR documentation, as tag option for IOS default-information originate command is parameter configurable within route-map construct, but concept should be the same.
Regards.
12-05-2019 06:22 AM
Hi Ivan,
the route tag should correspond to the ospf PID of your routing domain, that's why you see external default tagged with 10.
Could you try to alter the process-id to confirm it is expected behavior ?
Regards
12-05-2019 07:09 AM
Hi pigallo,
thanks for you reply
unfortunately i cannot change OSPF pid because it is production environment.
Do you have any referring for approving ?
12-05-2019 01:29 PM - edited 12-05-2019 01:35 PM
Hi Ivan,
tag tag-value | (Optional) 32-bit dotted-decimal value attached to each external route. This is not used by the OSPF protocol itself. It may be used to communicate information between autonomous system boundary routers (ASBRs). If a tag is not specified, then the configured OSPF process number is used.
you can find above reference under IOS XR documentation, as tag option for IOS default-information originate command is parameter configurable within route-map construct, but concept should be the same.
Regards.
12-05-2019 11:12 PM - edited 12-05-2019 11:13 PM
Thank you so much, Pigallo!
It exactly that im searching.
But of course i forgot\lazy about RTFM)
12-05-2019 08:34 PM - edited 12-05-2019 08:35 PM
privet, ivan
sorry, if this not really answering your question.. did you already check on that router with the following command
#show ip ospf interface brief
the second column 'PID' should list PID 10 that corresponds to tag 10?
12-06-2019 12:11 AM
@kstatinet wrote:privet, ivan
sorry, if this not really answering your question.. did you already check on that router with the following command
#show ip ospf interface brief
the second column 'PID' should list PID 10 that corresponds to tag 10?
yes, it's true, but i didn't know about
If a tag is not specified, then the configured OSPF process number is used.
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