07-27-2017 11:09 AM - edited 03-08-2019 11:30 AM
Hi,
I knew this but totally got about this for a moment.
I will very appreciate if you can remind me.
If I look at the mac address table, the ports says 'Router' (BOLD).
What does that mean?
xx-2#sh ip arp 10.18.30.35
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.18.30.35 - 5c50.156a.8c00 ARPA Vlan848
enc-wups-sn-r6509-2#
enc-wups-sn-r6509-2#
xx-2#sh mac add add 5c50.156a.8c00
Legend: * - primary entry
age - seconds since last seen
n/a - not available
S - secure entry
R - router's gateway mac address entry
D - Duplicate mac address entry
Displaying entries from DFC linecard [2]:
vlan mac address type learn age ports
----+----+---------------+-------+-----+----------+-----------------------------
R 399 5c50.156a.8c00 static No - Router
R 300 5c50.156a.8c00 static No - Router
07-27-2017 11:30 PM
That's probably the router's own IP address on that interface... what does "sh run int vlan848" look like?
07-28-2017 04:57 AM
Hi,
Thank you for your reply!
This is a L3 Switch. Then why doesn't it show what port that vlan belongs to unlike the others?
Also, when I type sh ip arp <other IP address>, nothings comes out. What does that mean when I don't get any output?
Thanks!
07-28-2017 06:10 AM
If the MAC address is that of a SVI of the router itself, how can it belong to a physical port?
If "sh ip arp <IP>" doesn't show anything it means that the router can't associate that IP to a MAC address (maybe the device configured with that IP address is powered off or disconnected for example).
07-28-2017 06:48 AM
Hi,
Thanks for your reply again.
I see that the interface is up up but still doesn't show the output..
07-28-2017 07:23 AM
What is the output of the following on the switch
show ip interface brief
Getting a bit lost as to what your are looking for now :-)
07-28-2017 12:20 PM
What I mean is that
Let's assume vlan 400 is data vlan. And a user is using it thru switch.
If I do sh ip arp <a users's IP> and the sh mac ad ad <user's mac>, I'm supposed to see the physical port. For instance Gi1/12 something like this..
But why does this show the port as 'Router'?
Vlan400 10.18.17.131 YES NVRAM up up
enc-wups-sn-r6509-2#sh ip arp 10.18.17.131
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.18.17.131 - 5c50.156a.8c00 ARPA Vlan400
enc-wups-sn-r6509-2#sh mac ad ad 5c50.156a.8c00
Legend: * - primary entry
age - seconds since last seen
n/a - not available
S - secure entry
R - router's gateway mac address entry
D - Duplicate mac address entry
Displaying entries from DFC linecard [2]:
vlan mac address type learn age ports
----+----+---------------+-------+-----+----------+-----------------------------
R 399 5c50.156a.8c00 static No - Router
R 300 5c50.156a.8c00 static No - Router
07-28-2017 12:37 PM
I see now.
What is the output of
show ip int brief
from your switch
07-28-2017 12:50 PM
enc-wups-sn-r6509-2#sh ip int b
Interface IP-Address OK? Method Status Protocol
Vlan400 10.18.17.131 YES NVRAM up up
07-28-2017 01:15 PM
Do you have a vlan interface 848?
sh run int vlan 848?
what are all the addresses from
show ip int brief
07-28-2017 02:24 AM
Is this a Layer 3 switch?
As an example - I have the following SVI, amongst others on a 6880X - 10.44.0.1
Vlan500 10.44.0.1 YES NVRAM up up
UK-CORE-01#sh arp 10.44.0.1
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.44.0.1 - 00c1.64a0.1300 ARPA Vlan500
UK-CORE-01#sh mac address-table | inc 00c1.64a0.1300
R 645 00c1.64a0.1300 static No - Router
R 641 00c1.64a0.1300 static No - Router
R 519 00c1.64a0.1300 static No - Router
R 523 00c1.64a0.1300 static No - Router
R 868 00c1.64a0.1300 static No - Router
It is referencing a local address tied to the logical interfaces.
07-28-2017 04:55 AM
Hi,
Thank you four your reply!
Yes it is L3 switch (6800).
Grant, I'm sorry bur I don't quite understand the last statement.
'It is referencing a local address tied to the logical interfaces.'...
Would you please explain in more detail?
07-28-2017 05:11 AM
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