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Special Forums IP Networking Proxy Server Linux Networking - VLANs & Multiple IP's Post 302920316 by PCB on Wednesday 8th of October 2014 06:22:16 PM
Old 10-08-2014
Linux Networking - VLANs & Multiple IP's

In a "typical" data centre environment (telco, financial services etc), would a Linux OS typically have one IP address connected to one VLAN or would it have many IPs and/or VLANs. I say "Linux OS" as I'm referring to an instance of the OS not necessarily a Host or server. Think Linux OS = VM in a virtualisation context. Its common for a server/host to have many IP's and possibly in different VLANs but would an OS (VM) within that host typically just have one IP in one VLAN?

I'm asking because of an ongoing debate with a Network team that wants different IP's and VLANs per Linux OS and have us put for example ssh onto one IP, and then server traffic (e.g. HTTP) onto another IP in order to separate traffic. Is this kind of thing common in a modern data centre or not? When would one go that approach vs just putting the OS onto the VLAN thats "most representative" of its function: E.g. web proxy in DMZ VLAN, App server in Backend VLAN etc etc.
 

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Info::CiscoVTP(3pm)					User Contributed Perl Documentation				       Info::CiscoVTP(3pm)

NAME
SNMP::Info::CiscoVTP - SNMP Interface to Cisco's VLAN Management MIBs AUTHOR
Max Baker SYNOPSIS
# Let SNMP::Info determine the correct subclass for you. my $vtp = new SNMP::Info( AutoSpecify => 1, Debug => 1, DestHost => 'myswitch', Community => 'public', Version => 2 ) or die "Can't connect to DestHost. "; my $class = $vtp->class(); print "SNMP::Info determined this device to fall under subclass : $class "; DESCRIPTION
SNMP::Info::CiscoVTP is a subclass of SNMP::Info that provides information about a Cisco device's VLAN and VTP Domain membership. Use or create in a subclass of SNMP::Info. Do not use directly. Inherited Classes None. Required MIBs CISCO-VTP-MIB CISCO-VLAN-MEMBERSHIP-MIB CISCO-VLAN-IFTABLE-RELATIONSHIP-MIB MIBs can be found at ftp://ftp.cisco.com/pub/mibs/v2/v2.tar.gz GLOBALS
$vtp->vtp_version() ("vtpVersion") $vtp->vtp_maxstore() ("vtpMaxVlanStorage") $vtp->vtp_notify() ("vtpNotificationsEnabled") $vtp->vtp_notify_create() ("vtpVlanCreatedNotifEnabled") $vtp->vtp_notify_delete() ("vtpVlanDeletedNotifEnabled") $vtp->vtp_trunk_set_serial() ("vlanTrunkPortSetSerialNo") TABLE METHODS
Your device will only implement a subset of these methods. $vtp->i_vlan() Returns a mapping between "ifIndex" and assigned VLAN ID for access ports and the default VLAN ID for trunk ports. $vtp->i_vlan_membership() Returns reference to hash of arrays: key = "ifIndex", value = array of VLAN IDs. These are the VLANs which are members of enabled VLAN list for the port. Example: my $interfaces = $vtp->interfaces(); my $vlans = $vtp->i_vlan_membership(); foreach my $iid (sort keys %$interfaces) { my $port = $interfaces->{$iid}; my $vlan = join(',', sort(@{$vlans->{$iid}})); print "Port: $port VLAN: $vlan "; } VLAN Table ("CISCO-VTP-MIB::vtpVlanTable") See ftp://ftp.cisco.com/pub/mibs/supportlists/wsc5000/wsc5000-communityIndexing.html <ftp://ftp.cisco.com/pub/mibs/supportlists/wsc5000/wsc5000-communityIndexing.html> for a good treaty of how to connect to the VLANs $vtp->v_index() ("vtpVlanIndex") $vtp->v_state() ("vtpVlanState") $vtp->v_type() ("vtpVlanType") $vtp->v_name() ("vtpVlanName") $vtp->v_mtu() ("vtpVlanMtu") $vtp->v_said() ("vtpVlanDot10Said") $vtp->v_ring() ("vtpVlanRingNumber") $vtp->v_bridge() ("vtpVlanBridgeNumber") $vtp->v_stp() ("vtpVlanStpType") $vtp->v_parent() ("vtpVlanParentVlan") $vtp->v_trans1() ("vtpVlanTranslationalVlan1") $vtp->v_trans2() ("vtpVlanTranslationalVlan2") $vtp->v_btype() ("vtpVlanBridgeType") $vtp->v_hop_are() ("vtpVlanAreHopCount") $vtp->v_hop_ste() ("vtpVlanSteHopCount") $vtp->v_crf() ("vtpVlanIsCRFBackup") $vtp->v_type_ext() ("vtpVlanTypeExt") $vtp->v_if() ("vtpVlanIfIndex") VLAN Membership Table ("CISCO-VLAN-MEMBERSHIP-MIB::vmMembershipTable") $vtp->i_vlan_type() Static, Dynamic, or multiVlan. ("vmVlanType") $vtp->i_vlan2() The VLAN that an access port is assigned to. ("vmVlan") $vtp->i_vlan_stat() Inactive, active, shutdown. ("vmPortStatus") $vtp->i_vlan_1() Each bit represents a VLAN. This is 0 through 1023 ("vmVlans") $vtp->i_vlan_2() Each bit represents a VLAN. This is 1024 through 2047 ("vmVlans2k") $vtp->i_vlan_3() Each bit represents a VLAN. This is 2048 through 3071 ("vmVlans3k") $vtp->i_vlan_4() Each bit represents a VLAN. This is 3072 through 4095 ("vmVlans4k") VLAN Membership Voice VLAN Table ("CISCO-VLAN-MEMBERSHIP-MIB::vmVoiceVlanTable") $vtp->i_voice_vlan() ("vmVoiceVlanId") Management Domain Table ("CISCO-VTP-MIB::managementDomainTable") $vtp->vtp_d_index() ("managementDomainIndex") $vtp->vtp_d_name() ("managementDomainName") $vtp->vtp_d_mode() ("managementDomainLocalMode") $vtp->vtp_d_rev() ("managementDomainConfigRevNumber") $vtp->vtp_d_updater() ("managementDomainLastUpdater") $vtp->vtp_d_last() ("managementDomainLastChange") $vtp->vtp_d_status() ("managementDomainRowStatus") $vtp->vtp_d_tftp() ("managementDomainTftpServer") $vtp->vtp_d_tftp_path() ("managementDomainTftpPathname") $vtp->vtp_d_pruning() ("managementDomainPruningState") $vtp->vtp_d_ver() ("managementDomainVersionInUse") VLAN Trunk Port Table ("CISCO-VTP-MIB::vlanTrunkPortTable") $vtp->vtp_trunk_mgmt_dom() ("vlanTrunkPortManagementDomain") $vtp->vtp_trunk_encaps_t() ("vlanTrunkPortEncapsulationType") $vtp->vtp_trunk_vlans() ("vlanTrunkPortVlansEnabled") $vtp->vtp_trunk_vlans_2k() ("vlanTrunkPortVlansEnabled2k") $vtp->vtp_trunk_vlans_3k() ("vlanTrunkPortVlansEnabled3k") $vtp->vtp_trunk_vlans_4k() ("vlanTrunkPortVlansEnabled4k") $vtp->vtp_trunk_native() ("vlanTrunkPortNativeVlan") $vtp->i_pvid() ("vlanTrunkPortNativeVlan") $vtp->vtp_trunk_rstat() ("vlanTrunkPortRowStatus") $vtp->vtp_trunk_dyn() ("vlanTrunkPortDynamicState") $vtp->vtp_trunk_dyn_stat() ("vlanTrunkPortDynamicStatus") $vtp->vtp_trunk_vtp() ("vlanTrunkPortVtpEnabled") $vtp->vtp_trunk_encaps() ("vlanTrunkPortEncapsulationOperType") SET METHODS
These are methods that provide SNMP set functionality for overridden methods or provide a simpler interface to complex set operations. See "SETTING DATA VIA SNMP" in SNMP::Info for general information on set operations. $vtp->set_i_vlan ( vlan, ifIndex ) Changes an access (untagged) port VLAN, must be supplied with the numeric VLAN ID and port "ifIndex". This method should only be used on end station (non-trunk) ports. Example: my %if_map = reverse %{$vtp->interfaces()}; $vtp->set_i_vlan('2', $if_map{'FastEthernet0/1'}) or die "Couldn't change port VLAN. ",$vtp->error(1); $vtp->set_i_pvid ( pvid, ifIndex ) Sets port default VLAN, must be supplied with the numeric VLAN ID and port "ifIndex". This method should only be used on trunk ports. Example: my %if_map = reverse %{$vtp->interfaces()}; $vtp->set_i_pvid('2', $if_map{'FastEthernet0/1'}) or die "Couldn't change port default VLAN. ",$vtp->error(1); $vtp->set_add_i_vlan_tagged ( vlan, ifIndex ) Adds the VLAN to the enabled VLANs list of the port, must be supplied with the numeric VLAN ID and port "ifIndex". Example: my %if_map = reverse %{$vtp->interfaces()}; $vtp->set_add_i_vlan_tagged('2', $if_map{'FastEthernet0/1'}) or die "Couldn't add port to egress list. ",$vtp->error(1); $vtp->set_remove_i_vlan_tagged ( vlan, ifIndex ) Removes the VLAN from the enabled VLANs list of the port, must be supplied with the numeric VLAN ID and port "ifIndex". Example: my %if_map = reverse %{$vtp->interfaces()}; $vtp->set_remove_i_vlan_tagged('2', $if_map{'FastEthernet0/1'}) or die "Couldn't add port to egress list. ",$vtp->error(1); perl v5.12.4 2011-09-28 Info::CiscoVTP(3pm)
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