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9507
July 4th, 2012 08:00
PC6248 Routing interfaces going offline when issuing the command "reload"
Hi All,
Really would appreciate some help here. We have a pair of Dell PC6248 switches, used as a consolidated L2/L3 environment. The switches are NOT stacked, just running them as a simple trunked pair of switches.
We are seeing some really strange issues when we issue a reload command on one of the switches in the pair, so to simplyfy the topology, let's say we have the following topology:
switch1 and switch2
VLAN100
172.18.100.0/24
Switch1 has a routing interface of = 172.18.100.2
Switch2 has a routing interface of = 172.18.100.3
The VRRP address = 172.18.100.1
VRRP seems to work fine, in terms of Mater / standby failover
However, if we issue a reload, of lets say switch 2, both 172.18.100.2 & 172.18.100.3 go offline and then come back online at pretty much the same time i.e. when the switch has completed its reboot.
Thanks so much in advance for any suggestions and so on.
Regards.
Daniel My
10 Elder
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6.2K Posts
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July 5th, 2012 12:00
Hello gh
That sounds very odd. The only time that should happen is if the switches are stacked. Can you create a console connection to both switches to see if they are both restarting?
Please run these commands and post the information:
Also, have you tested VRRP by powering off the master and checking to see if the slave takes over, and also making sure that the primary becomes master once it comes back online?
Thanks
gh55110s
3 Posts
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July 5th, 2012 16:00
Hi Daniel,
This is a wierd one, the switch is defo not rebooting, I can see that from the uptime counters. VRRP has been working, although I need to schedule some down time to do some more testing. The switch I'm rebooting has all the stand-by VRRP interfaces, so I don't expect there to be a takeover of the master. Mind you, I'll never know beacuse I lose connectivity to both switches as soon as I reload switch 2.
Any suggestions appreciated, so here's the info. My head hurts from banging it against a brick wall...
cenlan001#
cenlan001#show interfaces port-channel 1
Channel Ports Hash Algorithm Type
------- ----------------------------- -------------------
ch1 Active: 1/g45, 1/g46, 3
1/g47, 1/g48
Hash Algorithm Type
1 - Source MAC, VLAN, EtherType, source module and port Id
2 - Destination MAC, VLAN, EtherType, source module and port Id
3 - Source IP and source TCP/UDP port
4 - Destination IP and destination TCP/UDP port
5 - Source/Destination MAC, VLAN, EtherType, source MODID/port
6 - Source/Destination IP and source/destination TCP/UDP port
cenlan001#show running-config interface port-channel ?
Enter the Port-Channel Number.
cenlan001#show running-config interface port-channel 1
description 'lag1'
gvrp enable
spanning-tree cost 5000
spanning-tree mst 0 external-cost 5000
switchport mode trunk
switchport trunk allowed vlan add 1-6,10-11,20-21,30
cenlan001#show ip interface
Management Interface:
IP Address..................................... 0.0.0.0
Subnet Mask.................................... 0.0.0.0
Default Gateway................................ 0.0.0.0
Burned In MAC Address.......................... 5C26.0AD5.1874
Network Configuration Protocol Current......... DHCP
Management VLAN ID............................. 1
Routing Interfaces:
Netdir Multi
Interface State IP Address IP Mask Bcast CastFwd
---------- ----- --------------- --------------- -------- --------
vlan 9 Up 172.17.9.2 255.255.255.248 Disable Disable
vlan 20 Up 172.18.20.2 255.255.255.0 Disable Disable
vlan 2 Up 172.20.2.2 255.255.255.0 Disable Disable
vlan 3 Up 172.20.3.2 255.255.255.0 Disable Disable
vlan 4 Up 172.20.4.2 255.255.255.0 Disable Disable
vlan 21 Up 172.18.21.2 255.255.255.0 Disable Disable
vlan 30 Up 172.19.30.2 255.255.255.0 Disable Disable
loopback 0 Up 2.2.2.2 255.255.255.255 Disable Disable
cenlan001#
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
h
cenlan002#
cenlan002#show interfaces port-channel 1
Channel Ports Hash Algorithm Type
------- ----------------------------- -------------------
ch1 Active: 1/g45, 1/g46, 3
1/g47, 1/g48
Hash Algorithm Type
1 - Source MAC, VLAN, EtherType, source module and port Id
2 - Destination MAC, VLAN, EtherType, source module and port Id
3 - Source IP and source TCP/UDP port
4 - Destination IP and destination TCP/UDP port
5 - Source/Destination MAC, VLAN, EtherType, source MODID/port
6 - Source/Destination IP and source/destination TCP/UDP port
cenlan002#
cenlan002#show running-config interface port-channel 1
description 'lag1'
gvrp enable
switchport mode trunk
switchport trunk allowed vlan add 1-6,10-11,20-21,30
cenlan002#
cenlan002#show ip interface
Management Interface:
IP Address..................................... 0.0.0.0
Subnet Mask.................................... 0.0.0.0
Default Gateway................................ 0.0.0.0
Burned In MAC Address.......................... 5C26.0AD3.8BD4
Network Configuration Protocol Current......... DHCP
Management VLAN ID............................. 1
Routing Interfaces:
Netdir Multi
Interface State IP Address IP Mask Bcast CastFwd
---------- ----- --------------- --------------- -------- --------
vlan 2 Up 172.20.2.3 255.255.255.0 Disable Disable
vlan 3 Up 172.20.3.3 255.255.255.0 Disable Disable
vlan 4 Up 172.20.4.3 255.255.255.0 Disable Disable
vlan 8 Up 172.17.9.10 255.255.255.248 Disable Disable
vlan 20 Up 172.18.20.3 255.255.255.0 Disable Disable
vlan 30 Up 172.19.30.3 255.255.255.0 Disable Disable
vlan 21 Up 172.18.21.3 255.255.255.0 Disable Disable
loopback 0 Up 3.3.3.3 255.255.255.255 Disable Disable
cenlan002#
Daniel My
10 Elder
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6.2K Posts
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July 5th, 2012 17:00
The LAG connection looks fine.
I would say the issue is most likely one of three things:
That should help narrow down where the issue is occurring. Also, please include a general description of what is connected to the interfaces in the spanning tree output. They do not need to be detailed, but something like switch, PC, or server would help to tell if the ports need to be forwarding or not.
Thanks
gh55110s
3 Posts
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July 6th, 2012 01:00
Ahh, good old spanning tree and where I struggle the most.
the switch trunk / LAG ports g45 - g48 suggest that spanning tree is disabled, am I right in saying, its the one place where it should be enabled. I've enabled spanning tree on the LAG (which is port g45-48), or should I have enabled STP on the individual ports.
cenlan001#show spanning-tree port-channel 1
Port ch1 Enabled
State: Disabled Role: Disabled
Port id: 96.626 Port Cost: 5000
Port Fast: No (Configured: no ) Root Protection: No
Designated bridge Priority: 32768 Address: 80:00:5C:26:0A:D5:18:74
Designated port id: 96.626 Designated path cost: 0
CST Regional Root: 80:00:5C:26:0A:D5:18:74 CST Port Cost: 0
Root Guard..................................... FALSE
Loop Guard..................................... FALSE
TCN Guard...................................... FALSE
BPDU: sent 7, received 413
cenlan001#
cenlan001#show spanning-tree active
Spanning tree Enabled (BPDU flooding : Disabled) Portfast BPDU filtering Disabled mode rstp
CST Regional Root: 80:00:5C:26:0A:D5:18:74
Regional Root Path Cost: 0
###### MST 0 Vlan Mapped: 1-6, 8-11, 20-21, 30
ROOT ID
Address 80:00:5C:26:0A:D5:18:74
This Switch is the Root.
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Interfaces
Name State Prio.Nbr Cost Sts Role PortFast RestrictedPort
------ -------- --------- ---------- ---- ----- -------- -------
1/g3 Enabled 128.3 20000 FWD Desg No No
1/g4 Enabled 128.4 20000 FWD Desg No No
1/g6 Enabled 128.6 20000 FWD Desg No No
1/g8 Enabled 128.8 20000 FWD Desg No No
Name State Prio.Nbr Cost Sts Role PortFast RestrictedPort
------ -------- --------- ---------- ---- ----- -------- -------
1/g14 Enabled 128.14 20000 FWD Desg No No
1/g16 Enabled 128.16 20000 FWD Desg No No
1/g18 Enabled 128.18 20000 FWD Desg No No
1/g26 Enabled 128.26 20000 FWD Desg No No
1/g28 Enabled 128.28 20000 FWD Desg No No
1/g30 Enabled 128.30 20000 FWD Desg No No
1/g34 Enabled 128.34 20000 FWD Desg No No
1/g36 Enabled 128.36 20000 FWD Desg No No
1/g38 Enabled 128.38 20000 FWD Desg No No
1/g40 Enabled 128.40 20000 FWD Desg No No
1/g41 Enabled 128.41 200000 FWD Desg No No
1/g42 Enabled 128.42 20000 FWD Desg No No
1/g43 Enabled 128.43 20000 FWD Desg No No
1/g44 Enabled 128.44 20000 FWD Desg No No
1/g45 Disabled 128.45 0 FWD Disb No No
1/g46 Disabled 128.46 0 FWD Disb No No
Name State Prio.Nbr Cost Sts Role PortFast RestrictedPort
------ -------- --------- ---------- ---- ----- -------- -------
1/g47 Disabled 128.47 0 FWD Disb No No
1/g48 Disabled 128.48 0 FWD Disb No No
1/xg3 Enabled 128.51 2000 FWD Desg No No
1/xg4 Enabled 128.52 2000 FWD Desg No No
cenlan001#show ip vrrp interface brief
Interface VRID IP Address Mode State
--------- ---- -------------- ------ ------------
vlan 20 20 172.18.20.1 Enable Master
vlan 2 2 172.20.2.1 Enable Master
vlan 3 3 172.20.3.1 Enable Master
vlan 4 4 172.20.4.1 Enable Master
vlan 21 21 172.18.21.1 Enable Master
vlan 30 30 172.19.30.1 Enable Master
cenlan001#show stack-port
Configured Running
Stack Stack Link Link
Unit Interface Mode Mode Status Speed (Gb/s)
---- ---------------- ---------- ---------- ------------ ------------
1 xg1 Ethernet Ethernet Link Down Unknown
1 xg2 Ethernet Ethernet Link Down Unknown
1 xg3 Ethernet Ethernet Link Up 10
1 xg4 Ethernet Ethernet Link Up 10
Daniel My
10 Elder
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6.2K Posts
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July 6th, 2012 10:00
Spanning tree is configured correctly on the lag. RSTP should be disabled on the lag. If it were enabled then it would block ports on the LAG and negate the intention of creating a lag. If you enabled RSTP on the LAG then you should go back and disable it.
According to the output RSTP is disabled on the LAG ports. Disabling RSTP on a port causes it to not take part in RSTP elections. It will always be in a forwarding state if disabled.
This switch is the root bridge for RSTP so all ports are forwarding. This switch is also the master for VRRP. I do not see an issue with this switch's configuration. I would suggest running the same commands on the other switch.