Line protocol goes down after 24hrs between 3750 and 887

[Federico Olivieri]

Hi guys,

I have a problem with my set up that is getting me crazy

I have a cisco and switch 3750 connected together via ethernet. The switch port is configured with ip 10.10.10.2 255.255.255.252

The router port is configured in vlan 1 and the SVI for vlan 1 has p 10.10.10.1 255.255.255.252.

I don't know what happen but after a while the line protocol goes up and down. after 3 or 4 times it shows UP/UP but there is not communication between the ports. 

I tried many many things and just with reboot I'm able (not always!!) to restore everything. 

Ask me what ever you want because I have done all test possible!

Help!

[Richard Burts]

I find your description of the switch port and the router port to be a bit confusing. The description of the switch port sounds sort of like it is a routed port (which could be a reasonable thing to do) but the description of the router port talks about vlans and SVI which would be appropriate for a switch and not for a router. Could you clarify? And perhaps post the configuration of both interfaces? That way it would be clear whether the switch port is really an access port, a routed port, or a trunk port.

It also would help to know if routing is enabled on your 3750.

At the time when you are experiencing the issue get the output of show arp from the router and post it. Also get the output of show arp and of show mac address table from the switch.

HTH

Rick

[Federico Olivieri]

Hi, Yes that is my scenario. Below as required

//--Router

interface FastEthernet0
description +--MGMT+TRAFFIC--+
no ip address #Is a layer 2 port, I cannot configure and IP address  under interface(Cisco 887)
load-interval 30
duplex full
speed 100
hold-queue 1000 in
hold-queue 1000 out

interface Vlan1
description +--IP_MGMT+TRAFFIC--+
ip address 10.10.10.1 255.255.255.252
ip nat inside
ip virtual-reassembly in
ip tcp adjust-mss 1460
ipv6 address NODE-PD ::1/64
ipv6 enable
ipv6 nd other-config-flag
ipv6 dhcp server DHCP6
ntp broadcast client
ntp multicast client
ipv6 ospf 1 area 0
service-policy output DNS_LAN
hold-queue 1000 in
hold-queue 1000 out

887VA#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.10.10.1 - a493.4c73.0a2a ARPA Vlan1

Logs

Jan 20 17:19:11.033: %OSPFv3-5-ADJCHG: Process 1, Nbr 2.2.2.6 on Vlan1 from FULL to DOWN, Neighbor Down: Dead timer expired
Jan 20 17:47:11.386: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down

//--Switch

interface FastEthernet1/0/1
description +--CISCO_887VA--+
no switchport
ip address 10.10.10.2 255.255.255.252
speed 100
duplex full
priority-queue out
ipv6 address autoconfig
ipv6 enable
ipv6 ospf 1 area 0
mls qos trust dscp
spanning-tree portfast
end

C3750#show running-config | i routing
system mtu routing 1500
ip routing
ipv6 unicast-routing

Switch logs
an 20 17:47:11.448: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0/1, changed state to down
Jan 20 17:47:12.446: %LINK-3-UPDOWN: Interface FastEthernet1/0/1, changed state to down
Jan 20 17:47:12.455: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.4 on FastEthernet1/0/1 from INIT to DOWN, Neighbor Down: Interface down or detached
Jan 20 17:47:12.455: %OSPFv3-5-ADJCHG: Process 1, Nbr 1.1.1.6 on FastEthernet1/0/1 from INIT to DOWN, Neighbor Down: Interface down or detached
Jan 20 18:36:16.173: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0/2, changed state to down
Jan 20 18:36:17.171: %LINK-3-UPDOWN: Interface FastEthernet1/0/2, changed state to down
Jan 20 18:37:34.141: %LINK-3-UPDOWN: Interface FastEthernet1/0/1, changed state to up
Jan 20 18:37:35.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0/1, changed state to up

C3750#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.50.90 58 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.91 41 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.88 89 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.89 72 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.92 28 c03e.0fd6.cc39 ARPA Vlan50
Internet 10.10.10.2 - 0017.9579.1141 ARPA FastEthernet1/0/1
Internet 192.168.50.82 183 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.83 166 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.80 212 c03e.0fd6.cc39 ARPA Vlan50
Internet 10.10.10.1 8 a493.4c73.0a2a ARPA FastEthernet1/0/1
Internet 192.168.50.81 196 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.86 119 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.87 101 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.84 150 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.85 135 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.79 226 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.1 - 0017.9579.1144 ARPA Vlan50
Internet 192.168.50.5 17 c03e.0fd6.cc39 ARPA Vlan50
Internet 192.168.50.50 17 8c0e.e312.3073 ARPA Vlan50
Internet 192.168.0.3 1 000f.34ac.fa48 ARPA Vlan5
Internet 192.168.50.47 0 4437.e6db.03aa ARPA Vlan50
Internet 192.168.30.1 - 0017.9579.1143 ARPA Vlan30
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.30.11 28 783e.5307.92af ARPA Vlan30
Internet 192.168.0.254 - 0017.9579.1142 ARPA Vlan5

C3750#show mac address-table
Mac Address Table
-------------------------------------------

Vlan Mac Address Type Ports
---- ----------- -------- -----
All 0100.0ccc.cccc STATIC CPU
All 0100.0ccc.cccd STATIC CPU
All 0180.c200.0000 STATIC CPU
All 0180.c200.0001 STATIC CPU
All 0180.c200.0002 STATIC CPU
All 0180.c200.0003 STATIC CPU
All 0180.c200.0004 STATIC CPU
All 0180.c200.0005 STATIC CPU
All 0180.c200.0006 STATIC CPU
All 0180.c200.0007 STATIC CPU
All 0180.c200.0008 STATIC CPU
All 0180.c200.0009 STATIC CPU
All 0180.c200.000a STATIC CPU
All 0180.c200.000b STATIC CPU
All 0180.c200.000c STATIC CPU
All 0180.c200.000d STATIC CPU
All 0180.c200.000e STATIC CPU
All 0180.c200.000f STATIC CPU
All 0180.c200.0010 STATIC CPU
All ffff.ffff.ffff STATIC CPU
50 4437.e6db.03aa DYNAMIC Fa1/0/8
30 783e.5307.92af DYNAMIC Fa1/0/3
20 000f.34ac.fa49 DYNAMIC Fa1/0/5
20 b827.eb22.5e45 DYNAMIC Fa1/0/9
20 b827.eb28.6b3e DYNAMIC Fa1/0/7
20 d050.9953.f2fc DYNAMIC Fa1/0/6
5 000f.34ac.fa48 DYNAMIC Fa1/0/4
Total Mac Addresses for this criterion: 27

[Federico Olivieri]

Found by myself.

The input hold queue was full

887VA#show interfaces summary

*: interface is up
IHQ: pkts in input hold queue IQD: pkts dropped from input queue
OHQ: pkts in output hold queue OQD: pkts dropped from output queue
RXBS: rx rate (bits/sec) RXPS: rx rate (pkts/sec)
TXBS: tx rate (bits/sec) TXPS: tx rate (pkts/sec)
TRTL: throttle count

Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL
-----------------------------------------------------------------------------------------------------------------
* ATM0 0 0 0 2 37000 34 145000 32 0
* Dialer1 0 0 0 1688 37000 31 90000 27 0
Ethernet0 0 0 0 0 0 0 0 0 0
* FastEthernet0 0 0 0 0 150000 32 35000 26 0
FastEthernet1 0 0 0 0 0 0 0 0 0
FastEthernet2 0 0 0 0 0 0 0 0 0
FastEthernet3 0 0 0 0 0 0 0 0 0
NVI0 0 0 0 0 0 0 0 0 0
* Virtual-Access1 0 0 0 0 0 0 0 0 0
* Virtual-Access2 0 0 0 0 37000 34 145000 32 0
* Vlan1 1001 0 0 0 93000 31 32000 26 0

Increased the size of the queue under the interface and the traffic started to flow

[Richard Burts]

I am very glad that you were able to solve your own problem. +5 for you.

Thank you for posting back to the forum to let us know that you have solved the issue and what the problem was.

HTH

Rick

[Federico Olivieri]

Hi Richard,

However, the router doesn't behave as aspect. From the documentation, when input queue reach the limit the interface it should start to drop packets 

(http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/6343-queue-drops.html) 

In this case it does n' t happen and the interface get stuck.

A possible bug?

Federico

[Richard Burts]

Federico

It is certainly not what I would expect the router to do and does sound like a bug. If the router is covered by a maintenance agreement then it would be worth opening a case with Cisco TAC to verify (and possibly to make sure that they know about this issue).

HTH

Rick