6-3 - Troubleshoot PE-PE Connectivity

Question 1

IOS/IOS-XE Command:
show ip bgp vpnv4 vrf [vrf-name]

Answer 1

verify proper redistribution of CE routes into a per-VRF instance of BGP

Question 2

IOS-XR Command:
show bgp vpnv4 unicast vrf [vrf-name]

Answer 2

verify proper redistribution of CE routes into a per-VRF instance of BGP

Question 3

IOS/IOS-XE Command:
show ip bgp vpnv4 vrf [vrf-name] [ip-prefix]

Answer 3

verify the route distinguisher (RD) that prepends to the IPv4 prefix, the route targets (RTs) that attach to the CE route and the local BGP label attached to redistributed routes

Question 4

IOS-XR Command:
show bgp vpnv4 unicast vrf [vrf-name] [ip-prefix]

Answer 4

verify the route distinguisher (RD) that prepends to the IPv4 prefix, the route targets (RTs) that attach to the CE route and the local BGP label attached to redistributed routes

Question 5

IOS/IOS-XE Command:
router bgp [as-number]
address-family ipv4 vrf [vrf-name]
redistribute rip metric [value]

Answer 5

redistribute RIP into BGP

Question 6

IOS/IOS-XE Command:
router bgp [as-number]
address-family ipv4 vrf [vrf-name]
redistribute eigrp [as-number]

Answer 6

redistribute EIGRP into BGP

Question 7

IOS/IOS-XE Command:
router bgp [as-number]
address-family ipv4 vrf [vrf-name]
redistribute ospf process vrf [vrf-name] [match internal | external]

Answer 7

redistribute OSPF into BGP

Question 8

IOS/IOS-XE Command:
show ip bgp vpnv4 all [ip-prefix]

Answer 8

verify proper route propagation

Question 9

IOS/IOS-XE Command:
Router(config)# router rip
Router(config-router)# version 2
Router(config-router)# address-family ipv4 vrf [vrf-name ]
Router(config-router-af)# redistribute bgp [as-number] metric transparent

Answer 9

• Configures BGP to RIP redistribution
• ‘metric transparent’ takes the MED attribute and uses it as the RIP metric. Default behavior of RIP to BGP redistribution is to copy the IGP metric to MED, so this option on the other side would ensure that this IGP metric is preserved from CE to CE.

Question 10

IOS/IOS-XE Command:
Router(config)# router eigrp [as-number]
Router(config-router)# address-family ipv4 vrf [vrf-name]
Router(config-router-af)# autonomous-system [as-number]
Router(config-router-af)# redistribute bgp [as-number] metric [metric-value]

Answer 10

Configures BGP to EIGRP redistribution

Question 11

IOS/IOS-XE Command:
router(config)# router ospf [process-id] vrf [vrf-name]
router(config-router)# redistribute bgp [as-number] subnets

Answer 11

• Configures BGP to OSPF redistribution
• The subnets keyword is mandatory for proper operation.

Question 12

Content Review Question
Which of the following statements is true?

A. OSPF uses bandwidth, delay, reliability, and reliability to calculate the cost metric.
B. The IGP metric never copies into the MED attribute of the BGP route when an IGP route redistributes into BGP.
C. You do not need to configure the metric for routes from external EIGRP autonomous systems.
D. CE routes that PE routers receive must redistribute into MP-BGP.

Answer 12

D