Problems vlan remapping

César Contreras González · ‎02-25-2012

Problems in interface vlan remapping

I have 2 Nexus 5010 in HA, managing 5 Sw 2148.

I require to change interfaces that are in VLAN 10 to VLAN 280,

but when I switch vlan i lose connectivity between servers.

even change the server address to a new segment to the vlan 280. but nothing.

What do I need? or should I reconfigure?

------------------------------------------------

# SHow RUnning-config

version 4.1(3)N2(1a)
no feature telnet
no telnet server enable
feature tacacs+
cfs eth distribute
feature udld
feature interface-vlan
feature lacp
feature vpc
vpc domain 10
role priority 1
peer-keepalive destination 2.2.2.2
feature fex

role name default-role
description This is a system defined role and applies to all users.
username admin password 5 $1$fY90Voca$9/fvGrZC/yLYHP5mHtwkD/ role network-admin
username nextira password 5 $1$gYtiwF.T$AQV2mtuWr/LuVmbWim.JH/ role network-adm
in
no password strength-check
ip domain-lookup
ip domain-name tlcomm.com

ip host NEXUS_A 2.2.2.1
aaa group server tacacs+ tacacs
hostname NEXUS_A
class-map type qos jumbomtu
policy-map type qos jumbomtu
policy-map type network-qos jumbo
policy-map type network-qos jumbomtu
class type network-qos class-default
mtu 9216
system qos
service-policy type network-qos jumbomtu
fex 110
pinning max-links 1
description NEXUS2K_110
type "Nexus 2148T"
fex 111
pinning max-links 1
description NEXUS2K_111
type "Nexus 2148T"
fex 112
pinning max-links 1
description NEXUS2K_112

type "Nexus 2148T"
fex 113
pinning max-links 1
description NEXUS2K_113
type "Nexus 2148T"
fex 114
pinning max-links 1
description NEXUS2K_114
type "Nexus 2148T"
fex 115
pinning max-links 1
description NEXUS2K_115
type "Nexus 2148T"
snmp-server user admin network-admin auth md5 0xda56df7a586c74ce2638690f561fccd2
priv 0xda56df7a586c74ce2638690f561fccd2 localizedkey
snmp-server user nextira network-admin auth md5 0x8785744f5044febb932a618ec301be
36 priv 0x8785744f5044febb932a618ec301be36 localizedkey
snmp-server host 10.0.10.19 traps version 2c public udp-port 1163
snmp-server host 10.0.10.19 traps version 2c public udp-port 1165

vrf context management
vlan 1,10

vlan 130
name Produccion
vlan 140
name Administracion
vlan 280
name DELL_6248
vlan 290
name REDRESPADO
vlan 315
name Almacenamiento
vlan 325
name Admin_Virtual_I
spanning-tree vlan 280 priority 24576

interface Vlan1

interface Vlan10
no shutdown
ip address 20.0.10.251/16

interface Vlan140

ip address 172.20.20.25/24

interface Vlan290
no shutdown
description REDRESPALDO
ip address 20.1.13.251/16

interface port-channel1
description VPC_NEXUS_B
switchport mode trunk
vpc peer-link
spanning-tree port type network
speed 10000

interface port-channel2
description PORTCHANNEL_VSS_6509
switchport mode trunk
switchport trunk allowed vlan 130,140
vpc 2
speed 10000

interface port-channel110

description NEXUS2K_110
switchport mode fex-fabric
vpc 110
fex associate 110
service-policy type qos input jumbomtu

interface port-channel111
description NEXUS2K_111
switchport mode fex-fabric
vpc 111
fex associate 111

interface port-channel112
description NEXUS2K_112
switchport mode fex-fabric
vpc 112
fex associate 112

interface port-channel113
description NEXUS2K_113
switchport mode fex-fabric
vpc 113

fex associate 113
service-policy type qos input jumbomtu

interface port-channel114
description NEXUS2K_114
switchport mode fex-fabric
vpc 114
fex associate 114

interface port-channel115
description NEXUS2K_115
switchport mode fex-fabric
vpc 115
fex associate 115

interface Ethernet1/1
description NEXUS2K_110
switchport mode fex-fabric
fex associate 110
channel-group 110

interface Ethernet1/2

description NEXUS2K_111
switchport mode fex-fabric
fex associate 111
channel-group 111

interface Ethernet1/3
description NEXUS2K_112
switchport mode fex-fabric
fex associate 112
channel-group 112

interface Ethernet1/4
description NEXUS2K_113
switchport mode fex-fabric
fex associate 113
channel-group 113

interface Ethernet1/5
description NEXUS2K_114
switchport mode fex-fabric
fex associate 114
channel-group 114

interface Ethernet1/6
description NEXUS2K_115
switchport mode fex-fabric
fex associate 115
channel-group 115

.......

interface Ethernet110/1/13

description MEDIA_SERVER_1_M1

switchport access vlan 10

service-policy type qos input jumbomtu

interface Ethernet110/1/25
description MEDIA_SERVER_2_M1

switchport access vlan 10
service-policy type qos input jumbomtu

......

any thoughts?

Thanks

Reza Sharifi · ‎02-25-2012

Hi,

Did you make the new vlan active?

switch(config-vlan)# state {active | suspend}

HTH

mgalazka · ‎02-25-2012

I'm not sure if I understand the full picture of what you're trying to do.

I note in your config that on this N5K, you have an SVI configured for VLAN 10 but not for VLAN 280. Where is the routing occuring for the subnets in these VLANs?

Also I note that you are trunking two VLAN's towards a VSS pair, but not VLAN 10 or 280. Again, not really sure where your L3 boundary is supposed to be.

Please explain your L3 topology a bit further and that may help shed light on where your issue is.

If your L3 config/routing is all set up properly somewhere upstream (and the trunk is omitted from this config) -- then theoretically you should be able to change the IP Address of the server from the old subnet on VLAN10 to the new one on VLAN280 (at this point you lose connectivity to server), then change the access VLAN, and the server should be reachable on new IP. If this is the process you're trying to do, keep in mind you will take a service outage per server, as you need to coordinate the IP address change and the VLAN change. Also, keep in mind an SVI will stay down until there is an active port or trunk with it configured. You may need to wait a few seconds for the SVI to come up as well.

Hope this provides some help -- and I hope I will be able to give more concise answers once I better understand your L2/L3 topology.

Matt

César Contreras González · ‎02-26-2012

Hi, mgalazka ,Reza Sharifi, thanks for your help.

I have 125 servers in a backup independent LAN for NBU, with this segment 20.0.x.x/16. VLAN 10

This servers are organized in 6 cisco switches 2148. this switches are managed by two nx 5010 in HA, so, the confoguration in Nexus A an B for the interfaces for the 6 sw's 2148 should be the same.

The instruction is to switch all the servers from VLAN 10 to VLAN 280 without changing the ip addresses of the servers.

The VLAN 280 are active.

For testing, I take 2 servers to reassign from VLAN 10 to VLAN 280. but when i do that a lost conectivity on the servers.

I change the VLAN of the servers, deactvate and reactivate the NICs on the servers, but nothig.

Even i do the same test on VLAN 290, change the segmen to 20.1.x.x/16,

In short, I made many tests and came to the conclusion that something is missing from the configuration of the Nexus 5k for VLAN 280.

According to me, I just need to create the VLAN, make it active, and reassign the interfases of the sw 2148 on both sw 5010. but does not work and I do not know what may be the cause.

Cesar