Posted on August 11, 2020 4:02 pm
 |  Asked by Martin Wolf
 |  63 views
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Hello,

There is a configured L3 interfaces, which neither does show up as “connected route” in route table nor does its IP address appear when taking a look at the interface under bash.

However, I am able to pings this IP from its peer.

interface Ethernet53/1
mtu 9214
logging event link-status
no switchport
ip address 10.255.216.15/31
arp aging timeout 900
bfd echo

]$ ifconfig et53_1
et53_1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 10240
ether 28:99:3a:d1:d8:56 txqueuelen 1000 (Ethernet)
RX packets 206995 bytes 32168734 (30.6 MiB)
RX errors 0 dropped 13 overruns 0 frame 0
TX packets 206937 bytes 32994854 (31.4 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

 

#sh ip int br
Address
Interface IP Address Status Protocol MTU Owner
—————— ———————– ———— ————– ———– ——-
:
Ethernet53/1 10.255.216.15/31 up up 9214

 

 

#ping 10.255.216.15
connect: Network is unreachable

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Posted by Alexis Dacquay
Answered on August 12, 2020 12:55 pm

Hi Martin,

It should work

Is there some additional interface config such as a VRF?

If it is the case, then every command has an option "vrf <vrf-name>" to have the right routing table context.

 

Can you provide the complete outputs from "show run interface Ethernet53/1"

Do you have anything in the logs indicating issues?

What switch model is that, and what EOS version?

 

I took your config to illustrate how well it should work.

 

s7286(config-if-Et7)#sh ip int b
Address
Interface IP Address Status Protocol MTU Owner
----------------- ---------------------- ------------ -------------- ---------- -------
Ethernet7 10.255.216.15/31 up up 9214
Management1 10.83.28.218/22 up up 1500

 

s7286(config-if-Et7)#sh ip route

VRF: default
Codes: C - connected, S - static, K - kernel,
O - OSPF, IA - OSPF inter area, E1 - OSPF external type 1,
E2 - OSPF external type 2, N1 - OSPF NSSA external type 1,
N2 - OSPF NSSA external type2, B - BGP, B I - iBGP, B E - eBGP,
R - RIP, I L1 - IS-IS level 1, I L2 - IS-IS level 2,
O3 - OSPFv3, A B - BGP Aggregate, A O - OSPF Summary,
NG - Nexthop Group Static Route, V - VXLAN Control Service,
DH - DHCP client installed default route, M - Martian,
DP - Dynamic Policy Route, L - VRF Leaked,
RC - Route Cache Route

Gateway of last resort:
S 0.0.0.0/0 [1/0] via 10.83.28.1, Management1

C 10.83.28.0/22 is directly connected, Management1
C 10.255.216.14/31 is directly connected, Ethernet7

 

s7286(config-if-Et7)#ping 10.255.216.15
PING 10.255.216.15 (10.255.216.15) 72(100) bytes of data.
80 bytes from 10.255.216.15: icmp_seq=1 ttl=64 time=0.065 ms
80 bytes from 10.255.216.15: icmp_seq=2 ttl=64 time=0.017 ms
80 bytes from 10.255.216.15: icmp_seq=3 ttl=64 time=0.017 ms
80 bytes from 10.255.216.15: icmp_seq=4 ttl=64 time=0.017 ms
80 bytes from 10.255.216.15: icmp_seq=5 ttl=64 time=0.016 ms

--- 10.255.216.15 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.016/0.026/0.065/0.019 ms, ipg/ewma 0.060/0.045 ms

 

s7286(config-if-Et7)#bash ifconfig et7
et7: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9214
inet 10.255.216.15 netmask 255.255.255.254 broadcast 255.255.255.255
ether 28:99:3a:41:cb:57 txqueuelen 1000 (Ethernet)
RX packets 54 bytes 6694 (6.5 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5 bytes 1145 (1.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

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