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Community Member

routing disappearing???

hi:Recently, my 6509 bring me a big bad surprise after I enter seven commands “no distributed-list XXX in|out interfaceYYY” at the same time. I mean that I paste the seven commands into the SecureCRT that it has logged in my 6509, and then some routings that do not come from interfaceYYY lost. They do not appear until I type the command “clear ip route * ” and “clear ip eigrp neighbors” at my 6509 after 10mins.

The seven commands applied to my 6509 and topology as follows:

router eigrp 1

no distribute-list denyCFF_host in Vlan811

no distribute-list denyCFF_host in Vlan812

no distribute-list denyCFF_host in GigabitEthernet1/4

no distribute-list denyCFF_host out Port-channel3

no distribute-list denyCFF_host in Port-channel3

no distribute-list denyCFF_forTZHClient out Port-channel5

no distribute-list denyCFF_host in Port-channel5

topology see attachment

I have an idea about routing that come from vlan803, vlan804 disappearing. Whether paste action make this issue? “no distribute-list” can break the connection between neighbors at a moment, and then rebuild their connection and exchange their routing each other. Many “no distribute-list” may be can lead my6509 into computation overhead, or routing table invalidation, so as to portion of routing disappearing.

Can you give me an answer? Or you can tell me the performing process of “no distribute-list” .

Thanks.

Relative information:

My6509

IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(18)SXF, RELEASE SOFTWARE (fc1)

System image file is "disk0:s72033-ipservicesk9_wan-mz.122-18.SXF.bin"

cisco WS-C6509 (R7000) processor (revision 3.2) with 458720K/65536K bytes of memory.

SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache

6509-1

IOS (tm) c6sup2_rp Software (c6sup2_rp-JSV-M), Version 12.1(13)E11, EARLY DEPLOYMENT RELEASE SOFTWARE (fc2)

System image file is "sup-bootflash:c6sup22-jsv-mz.121-13.E11"

cisco Catalyst 6000 (R7000) processor with 112640K/18432K bytes of memory.

R7000 CPU at 300Mhz, Implementation 39, Rev 3.3, 256KB L2, 1024KB L3 Cache

6509-2

IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(18)SXF, RELEASE SOFTWARE (fc1)

System image file is "disk0:s72033-ipservicesk9_wan-mz.122-18.SXF.bin"

cisco WS-C6509 (R7000) processor (revision 3.2) with 458720K/65536K bytes of memory.

SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache

6509-3

IOS (tm) MSFC2A Software (C6MSFC2A-PK9SV-M), Version 12.2(17d)SXB10, RELEASE SOFTWARE (fc1)

System image file is "bootflash:c6msfc2a-pk9sv-mz.122-17d.SXB10.bin"

cisco MSFC2A (R7000) processor (revision MSFC2A) with 229376K/32768K bytes of memory.

R7000 CPU at 300Mhz, Implementation 0x27, Rev 3.3, 256KB L2, 1024KB L3 Cache

3662

IOS (tm) 3600 Software (C3660-I-M), Version 12.1(5)T8, RELEASE SOFTWARE (fc1)

System image file is "flash:c3660-i-mz.121-5.T8"

cisco c3660 (R527x) processor (revision C0) with 122880K/8192K bytes of memory.

R527x CPU at 225Mhz, Implementation 40, Rev 10.0, 2048KB L2 Cache

7206

IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(2)T, RELEASE SOFTWARE (fc1)

System image file is "disk0:c7200-is-mz.122-2.T.bin"

cisco 7206VXR (NPE400) processor (revision A) with 114688K/16384K bytes of memory.

R7000 CPU at 350Mhz, Implementation 39, Rev 3.3, 256KB L2, 4096KB L3 Cache

2 REPLIES

Re: routing disappearing???

Hello there,

Just as a remimder, clear ip route * command only clears the IP routing table, but, EIGRP keeps all possible routes in its topology table, so this command doesnt cause EIGRP to send any messages or relearn new topology information, it only refills its routing table with the best routes from the topology table. You need to use clear ip eigrp neighbor to clear the entire topology table.

Im not really sure what happened in your case, but I believe its always a good practice to clear the routing table (and sometime neighbor adj) when modifying your filtering rules.

HTH a bit,

please remember to rate all the posts.

Vlad

Community Member

Re: routing disappearing???

hi, Vlad. thanks your words first.

I think that "no distribute-list" just modify the routing table. But I find there are many eigrp neighbor down and up information at log in my6509, and log time can match the time of routing loss. Why?

Can you tell me the truth of "distribute-list", or tell me where I can find it?

thanks a lot.

sun

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