CCIE R&S v5 Exam Review on 30 July 2015
Issue: Host (client) not receiving ip address. Host configured with manual MAC address, VLAN 12 not created in switch ( int vlan 12 down/down).
Solution: Change the client identifier in DHCP server, create vlan 12 in Switch 2
Issue: DHCP pool is not created R12, IPCP route default is not present in R17.
Solution: create DHCP pool in R12 and IPCP route default in R17 serial interface configuration.
Issue: R5 is advertising with maximum metric, OSPF cost 1 is configured in R21 and some other cost is configured in R22.
Solution: Remove max-metric router-lsa in R5, remove OSPF cost command in corresponding routers.
Issue: incorrect bandwidth configured on R12, incorrect delay is configured in interface of R13.
Solution: Removed incorrect Bandwidth and delay. To achieve 1703 add metric weight 0 1 1 1 1 1 in all 4 eigrp routers
Issue: Traffic from R12 is not load shared between R4 & R6, maximum path command is missing in R12. Traffic destined to internet (126.96.36.199) goes via R22 where it is supposed to go via R21.
Solution: Add maximum path 2 command in R12. There is a preconfigured route-map in R21 & R22, use that to manipulate metric and local preference
Issue: Mobile site can’t able to ping destination. Here you are not allowed to make changes in R22, so should not alter IPV6 access-list in R22. In R25 next hop address is wrong
Solution: In R25 Change next hop address as IPV6 address of serial interface of R25.
Issue: PC 111 can’t able to ping to Server (PC 102 ), spoke to spoke communication is not working, trace goes to R15 tunnel interface and drop there.
Reason: R15 have configuration “Redistribute connected route-map DEFAULT” which only redistribute Default route into EIGRP. And due to split horizon hub is not advertising routes to its spokes.
Solution: NHRP mapping is wrong in R17, correct it. Second issue can de shorted in two ways, either by changing route-map or by just disabling split horizon in tunnel interface ( go to second option, it is very easy and time saving)
Requirement: Traffic to internet must go through R7 and trace from remote site (PC 105 ) to remote site (106) should also go through R7.
Issue: R7 and R8 does not originate default route in for neighbour 188.8.131.52X. R8 does not have route-map MED
R3 not advertising 184.108.40.206 network
VRF import export is not properly configured.
VRF forwarding is not present on R5’s E0/1 facing to R9.
Solution: Give default originate in R7 & R8 for neighbour 220.127.116.11X. Create route map MED in R8 with higher metric and apply in R8 for neighbour 18.104.22.168 “ neigh 22.214.171.124 default-originate route-map MED”
Advertise network 126.96.36.199 in R3
R3 & R4 should import route targets exported by R5 & R6. Where R5 & R6 should import only route target exported by R3 R4 ( 65100:100)
Configure VRF in R5’s interface.
R5(conf)# int e0/1
R5(conf-if)# ip VRF forwarding BancoBank
Make sure that you have pre configuration of R5’s E0/1 interface by providing # sh run int e0/1
ISSUE: NAT statement is wrong (NAT outside). DMVPN mapping is wrong
Solution: Correct NAT statement in R23.( ip nat inside source list 172 int se 4/0 overload ).
Check for correct DMVPN mapping.
If the DMVPN doesn’t come up. Just shutdown tunnel interface in both hub and spoke and give no shut at same tme.
Issue: ip domain lookup is disabled on R21. R23 e0/0 interface is configured with secondary ip address 192.168.1.200.
Solution: enable ip domain lookup in R21. Remove secondary ip address from R23 E0/0 in terface, so that NAS get proper IP address from DHCP server without any address conflicts.
Switching – Wrong VTP password SW3,
Check SW3 configuration output. Sw3 does not have any vlan,where VTP server SW1 have many Vlan. So select SW3, issue command # sh vtp status. Ask for VTP password.
DMVPN – Midchain error.
Check EIGRP configuration in R15, it contains redistribute connected route-map CONNECTED, which denies E0/0 of R15. So the issue exist with R16, go to R16 configuration and check interface configuration E0/0 of R16 have /29 subnet mask and in eigrp it redistribute connected routes.
Sol : Click on R16. Increase the subnet length of R16 from /29 to /30
This question is new and very confusing. uRPF loose mode is configured in R1, where uRPF strict mode is configured in R2. R1 can able to ping 188.8.131.52 but not able to ping 184.108.40.206,
Solution: Part 1, drag and drop 8 steps. I am not sure about this part.
Part 2: traffic drop due to “uRPF strict mode- with load share per destination.
Most of things are same as we practised. Read question carefully wordings will be different.
In R16, R17, R 18, R19 instead of specifying VRF in question they stated all four routers must maintain separate BGP instance.
Regarding IPV6 there is small change. In SW3 and SW4 loopbacks IPV6 general prefix is configured, we have to give specific prefix. I didn’t do this because loopbacks of SW3 and SW4 matters only in NTP session.
In R12 and R14 there are two sub interfaces. E0/1.4 and E0/1.6 where IPV4 address is configured in E0/0.4 and IPV6 address is configured on E0/0.6.
Rest everything is same. Save your congigurtion often and in beginning of exam give these following command for backup purpose