19.08.2020 23:21, Gert Doering wrote:
> On Wed, Aug 19, 2020 at 10:03:29PM +0700, Eugene Grosbein wrote:
>> I have not such routes: the command "show ip route | include 0/1$" shows
>> nothing.
>> The interface Gi0/1 does not have any IP configuration itself, only its
>> sub-interfaces have.
>
> Do you have a subinterface with no "encaps dot1q ..." configured? That
> would be "untagged" then.
Thanks, I did not think about it. There were some left-over subinterfaces in
the configuration
with empty settings at all (and without encapsulation) and I've just removed
all such interfaces.
Still, ARP requests continue to come.
> Otherwise, ask the router - "debug arp" - and for each ARP request you
> see it issue, check the routing whether it points directly to an
> interface.
Well, I have packet capture in my analyzer and I see all the details there,
like this:
# tcpdump -s0 -en -i $incoming ether dst ff:ff:ff:ff:ff:ff and ether src
00:26:99:28:e6:1a
23:59:06.629164 00:26:99:28:e6:1a > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806),
length 60: Request who-has 10.19.0.19 tell 10.19.0.254, length 46
At the router:
#show ip route 10.19.0.19
Routing entry for 10.19.0.0/24
Known via "connected", distance 0, metric 0 (connected, via interface)
Redistributing via eigrp 200
Advertised by eigrp 200
Routing Descriptor Blocks:
* directly connected, via GigabitEthernet0/1.10
Route metric is 0, traffic share count is 1
#show run int GigabitEthernet0/1.10
Building configuration...
Current configuration : 260 bytes
!
interface GigabitEthernet0/1.10
encapsulation dot1Q 10
ip address 10.19.1.254 255.255.255.0 secondary
ip address 10.19.0.254 255.255.255.0
end
(interface description and ip access-groups not shown)
> (And never believe what switches say about tagging vs. not)
I've saved capture to PCAP file and verified it with Wireshark, no tags.
Still cannot understand why no tags.
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