Seeing ARP entries on shut down VLAN interface.

Question

Hi, 
As you can see below I see a mac address picked up on VLAN 1 on this switch, however vlan 1 interface is shut down? This is causing connectivity issues so does any one know why it is happening? 
Cheers 
DP1-West#sh arp   
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  10.10.10.198        11   0050.56ae.0aab  ARPA   Vlan1
Internet  20.20.20.1            0   4403.a754.8300  ARPA   Vlan666
Internet  20.20.20.54           -   34db.fd2e.6d41  ARPA   Vlan666
DP1-West#
DP1-West#
DP1-West#sh ru int vlan 1 
Building configuration...
Current configuration : 65 bytes
interface Vlan1
 no ip address
 no ip proxy-arp
 shutdown
end
DP1-West#sh ru int vlan 666
Building configuration...
Current configuration : 82 bytes
interface Vlan666
 ip address 20.20.20.54 255.255.255.0
 no ip proxy-arp
end
DP1-West#sh ver 
Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.0(2)EX5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Fri 21-Feb-14 05:54 by prod_rel_team
ROM: Bootstrap program is C2960X boot loader
BOOTLDR: C2960X Boot Loader (C2960X-HBOOT-M) Version 15.0(2r)EX, RELEASE SOFTWARE (fc1)

Answer 1

Thanks for helping actually i was reading this part from book
There are no SVIs active on the MSFC-not even VLAN 1. Let's add an SVI for VLAN 20 and see what happens:
Code View: Scroll / Show All
MSFC-6509# conf t
Enter configuration commands, one per line. End with CNTL/Z.
MSFC-6509(config)# int vlan 20
MSFC-6509(config-if)# ip address 10.20.20.1 255.255.255.0
MSFC-6509(config-if)# no shut
MSFC-6509(config-if)# ^Z
MSFC-6509#
17w2d: %LINK-3-UPDOWN: Interface Vlan20, changed state to down
17w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to down
MSFC-6509#
MSFC-6509# sho ip int brief
Interface IP-Address OK? Method Status Protocol
Vlan20 10.20.20.1 YES manual down down
The SVI is now there, but it won't come up. The SVI will not come up unless there is an active port in the VLAN in layer two. I often forget this fact and, after adding the SVIs, go off to create my VLANs only to find that none of them will come up. To illustrate the point, I'll assign an IP address to the CatOS management interface SC0, and place it in VLAN 20. This will put an active device in the VLAN:
CatOS-6509: (enable) set int sc0 20 10.20.20.20 255.255.255.0
Interface sc0 vlan set, IP address and netmask set.
Now, with something active in VLAN 20, the VLAN 20 SVI comes up in the MSFC:
Code View: Scroll / Show All
MSFC-6509# sho ip int brief
Interface IP-Address OK? Method Status Protocol
Vlan20 10.20.20.1 YES manual up up
Now i know that Sc0 management IP of Cat OS is assigned at switching side.and we can assign only 1 ip at switching side which is using CatOS right?