From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Wed Oct 24 2007 - 21:21:58 ART
On standard 10meg Ethernet interfaces the native VLAN must be 1.
--Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP) bdennis@internetworkexpert.com
Internetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Direct: 775-852-3995 (Outside the US and Canada)
kuldip singh wrote: > Hi, > > It seems like I can't get the native VLAN to work. As shown below > I have two sub-interfaces configured on R4, vlan 10 and vlan 555. if the > sub-interfaces are configured as trunk ports and the switchport is > configured as trunk port I can ping the 10.10.10.201 and 131.10.160.5 (R5 > connected to switch 3). If I change the sub-interface on R4 (e0/1.10 ) to > mark vlan 10 as native and change the config on switch 4 to mark the vlan 10 > as native. I can't ping 10.10.10.201 address, but I can still ping vlan 555 > ok. > Can somebody spot the issue. (This is from one of the NMC documents). > > > Thanks > > > R4: (R4 connected to Switch 4) > > > interface Ethernet0/1 > no ip address > half-duplex > ! > interface Ethernet0/1.10 > encapsulation dot1Q 10 > ip address 10.10.10.1 255.255.255.0 > no snmp trap link-status > ! > interface Ethernet0/1.555 > encapsulation dot1Q 555 > ip address 131.10.160.1 255.255.255.0 > no snmp trap link-status > > > > SW4: > > interface FastEthernet0/4 > switchport trunk encapsulation dot1q > switchport mode trunk > > interface Vlan10 > ip address 10.10.10.201 255.255.255.0 > > > SW3; > > interface FastEthernet0/5 > switchport access vlan 555 > switchport mode access > > > > Ping from R4; > > Rack9SW4#ping 10.10.10.201 > > Sending 1, 100-byte ICMP Echos to 10.10.10.201, timeout is 2 seconds: > ! > Success rate is 100 percent (1/1), round-trip min/avg/max = 4/4/4 ms > Rack9SW4# > > Sending 1, 100-byte ICMP Echos to 131.10.160.5, timeout is 2 seconds: > ! > Success rate is 100 percent (1/1), round-trip min/avg/max = 1/1/1 ms > Rack9SW4# > > > > > Now change the config on R4 and SW4 to make VLAN 10 native. > > R4: > > interface Ethernet0/1.10 > encapsulation dot1Q 10 native > ip address 10.10.10.1 255.255.255.0 > no snmp trap link-status > end > > > > SW4: > > interface FastEthernet0/4 > switchport trunk encapsulation dot1q > switchport trunk native vlan 10 > switchport mode trunk > end > > > Ping from R4: > > Rack9R4#ping 10.10.10.201 > > Type escape sequence to abort. > Sending 5, 100-byte ICMP Echos to 10.10.10.201, timeout is 2 seconds: > ..... > Success rate is 0 percent (0/5) > Rack9R4# > > Rack9R4#ping 131.10.160.5 > > Type escape sequence to abort. > Sending 5, 100-byte ICMP Echos to 131.10.160.5, timeout is 2 seconds: > !!!!! > Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms > Rack9R4# > > > debug on the route R4 indicates encapsulation failure when vlan 10 is made > native. > > Oct 24 08:34:38.682: IP: s=10.10.10.1 (local), d=10.10.10.201(Ethernet0/1.10), > len 100, sending > Oct 24 08:34:38.686: IP: s=10.10.10.1 (local), d=10.10.10.201(Ethernet0/1.10), > len 100, encapsulation failed. > Oct 24 08:34:40.682: IP: tableid=0, s=10.10.10.1 (local), d=10.10.10.201(Ethern > et0/1.10), routed via RIB > Oct 24 08:34:40.682: IP: s=10.10.10.1 (local), d=10.10.10.201(Ethernet0/1.10), > len 100, sending > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Fri Nov 16 2007 - 13:11:18 ART